Fooling AI Agents: Web-Based Indirect Prompt Injection Observed in the Wild

    Date: 03/05/2026

    Severity: High

    Summary

    Large language models (LLMs) and AI agents are increasingly integrated into browsers, search engines, and automated content-processing systems. While this expands functionality, it also introduces a new and largely unexplored attack surface. A key threat is indirect prompt injection (IDPI), where attackers hide malicious instructions within website content that is later processed by an LLM. Instead of interacting with the model directly, attackers exploit features like webpage summarization or content analysis. This can cause the LLM to unknowingly execute attacker-controlled prompts, with impact depending on the system’s privileges and sensitivity. Real-world telemetry now shows that IDPI attacks are actively being weaponized by malicious websites with previously undocumented attacker intentions.

    Indicators of Compromise (IOC) List

    Domains\URLs :

    1winofficialsite.in

    cblanke2.pages.dev

    dylansparks.com

    ericwbailey.website/published/accessibility-preference-settings-information-architecture-and-internalized-ableism

    leroibear.com

    llm7-landing.pages.dev/_next/static/chunks/app/page-94a1a9b785a7305c.js

    myshantispa.com

    perceptivepumpkin.com

    reviewerpress.com/advertorial-maxvision-can/?lang=en

    reviewerpressus.mycartpanda.com

    shiftypumpkin.com

    splintered.co.uk

    storage3d.com/storage/2009.11

    trinca.tornidor.com

    turnedninja.com

    runners-daily-blog.com

    buy.stripe.com/7sY4gsbMKdZwfx39Sq0oM00

    buy.stripe.com/9B600jaQo3QC4rU3beg7e02

    paypal.me/shiftypumpkin

    Gurucul Threat Detection and Incident Response (TDIR) Queries for Detection

    Detection Query 1 :

    domainname like "shiftypumpkin.com" or url like "shiftypumpkin.com" or siteurl like "shiftypumpkin.com" or domainname like "turnedninja.com" or url like "turnedninja.com" or siteurl like "turnedninja.com" or domainname like "cblanke2.pages.dev" or url like "cblanke2.pages.dev" or siteurl like "cblanke2.pages.dev" or domainname like "runners-daily-blog.com" or url like "runners-daily-blog.com" or siteurl like "runners-daily-blog.com" or domainname like "1winofficialsite.in" or url like "1winofficialsite.in" or siteurl like "1winofficialsite.in" or domainname like "dylansparks.com" or url like "dylansparks.com" or siteurl like "dylansparks.com" or domainname like "ericwbailey.website/published/accessibility-preference-settings-information-architecture-and-internalized-ableism" or url like "ericwbailey.website/published/accessibility-preference-settings-information-architecture-and-internalized-ableism" or domainname like "leroibear.com" or url like "leroibear.com" or siteurl like "leroibear.com" or domainname like "llm7-landing.pages.dev/_next/static/chunks/app/page-94a1a9b785a7305c.js" or url like "llm7-landing.pages.dev/_next/static/chunks/app/page-94a1a9b785a7305c.js" or siteurl like "llm7-landing.pages.dev/_next/static/chunks/app/page-94a1a9b785a7305c.js" or domainname like "myshantispa.com" or url like "myshantispa.com" or siteurl like "myshantispa.com" or domainname like "perceptivepumpkin.com" or url like "perceptivepumpkin.com" or siteurl like "perceptivepumpkin.com" or domainname like "reviewerpress.com/advertorial-maxvision-can/?lang=en" or url like "reviewerpress.com/advertorial-maxvision-can/?lang=en" or siteurl like "reviewerpress.com/advertorial-maxvision-can/?lang=en" or domainname like "reviewerpressus.mycartpanda.com" or url like "reviewerpressus.mycartpanda.com" or siteurl like "reviewerpressus.mycartpanda.com" or domainname like "splintered.co.uk" or url like "splintered.co.uk" or siteurl like "splintered.co.uk" or domainname like "storage3d.com/storage/2009.11" or url like "storage3d.com/storage/2009.11" or siteurl like "storage3d.com/storage/2009.11" or domainname like "trinca.tornidor.com" or url like "trinca.tornidor.com" or siteurl like "trinca.tornidor.com" or domainname like "buy.stripe.com/7sY4gsbMKdZwfx39Sq0oM00" or url like "buy.stripe.com/7sY4gsbMKdZwfx39Sq0oM00" or siteurl like "buy.stripe.com/7sY4gsbMKdZwfx39Sq0oM00" or domainname like "buy.stripe.com/9B600jaQo3QC4rU3beg7e02" or url like "buy.stripe.com/9B600jaQo3QC4rU3beg7e02" or siteurl like "buy.stripe.com/9B600jaQo3QC4rU3beg7e02" or domainname like "paypal.me/shiftypumpkin" or url like "paypal.me/shiftypumpkin" or siteurl like "paypal.me/shiftypumpkin" 

    Reference:

    https://unit42.paloaltonetworks.com/ai-agent-prompt-injection/


    Tags

    Threat ActorAILLMs

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