Malicious PDF — malware analysis report

Static analysis result for SHA-256 6186b2f5f41e808f…

MALICIOUS

PDF

53.3 KB Created: 2021-05-15 08:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9ca976f617e7060ee8d8c53e25da0bc SHA-1: bbe73f7ebec2e6736fcf5b6ad05ebb2eec8034d0 SHA-256: 6186b2f5f41e808fa64b7d3fde63266d3ec714f0fd6fda5058d4f097eea32c1e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to 'blended vowel worksheets', a common lure for educational or resource-based phishing attempts. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6272

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=blended+vowel+worksheets
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/8d6tlj53osil6kvsr5suhf9l9l/ruwewe.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f804832ac---10329228744.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bd965d36---60013283755.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160852bb561834---pafimomegunarinidosiruwo.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/7df661e0723a83e917353a65f86fc9b1/bivipokodokugi.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddc1d5629d---favedejivax.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b4i2rl3e9b4igi38pn3f9cnbv3/84416630417.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c636e677ccb62886c086397c853cbfdd/wufovowodimex.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/s29p4147tfpvfnpmes4thl2lam/dojun.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/mcvimmhlpfe9isopghpl0n1p3c/ludovujosesiwogade.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/bf37bdb6102ff6b7b5e9d70eef839697/zujag.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/4790fe678f3988ba2163a65ae60ba926/bixilaluvugukefifobaxu.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef2924f2a---26863701102.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6315aca81fc91eece2a4a4e8a749c348/95661377535.pdf

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