Malicious PDF — malware analysis report

Static analysis result for SHA-256 684920e6fb84c980…

MALICIOUS

PDF

39.0 KB Created: 2021-10-30 10:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dee77506d0a2ed8a60bcf70a10c08434 SHA-1: c84a59ae6dfa4fa8a36b4fef000c606dc2e8945c SHA-256: 684920e6fb84c9802476f10812d0b831e3a3e41887fa49eec7924a81d68b0c3d
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was identified as malicious by ClamAV and a machine learning classifier. Heuristics indicate it's an image-only document designed as a lure, containing numerous links to external PDF files hosted on potentially disposable domains. This suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42f58d8fa---13550965135.pdf In PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161405458a89bc---94204319876.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/77705538029.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/vinego.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/17093118483.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/66471894292.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/4950999722.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/58777168572.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/70314830839.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/xetomapolumalutifugap.pdfIn PDF document text
    • http://pb-book.com/user_file/file/47079199802.pdfIn PDF document text
    • http://ore-processing.ru/d/files/wujej.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/zaguvifurasu.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/tobus.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/kixuzitamiparagej.pdfIn PDF document text
    • https://phunhai.net/upload/files/73874429748.pdfIn PDF document text
    • http://exoticland.bg/upload/filesIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/cmwvf4RlXg4/uplcv?utm_term=fortnite+out+westPDF link annotation

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