Malicious PDF — malware analysis report

Static analysis result for SHA-256 21455d3bab343c1a…

MALICIOUS

PDF

44.6 KB Created: 2021-09-04 01:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e69e47bef2b5a6fe22869f30159ab89f SHA-1: b1e7b50916a0df05a994a92a498dd86ef67055f2 SHA-256: 21455d3bab343c1a5a908e255bfaffa44c1f9df368cee92131d1f17abd3ab352
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 embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of hosting malicious links within the document. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5141

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c196643c7c---35923103403.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf461378b99---29732283056.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/derula.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/25047211098.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-26/20210826070929562142.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830aa03a83c---4749250318.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c703797a5---14274530069.pdfIn PDF document text
    • http://evansmedia.ca/userfiles/file/buzivabaxonasirof.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3196a71227---23199804611.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/678f172e3ee71e249ccdf8d7d9eea1a7/5218351502.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/xusanib.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/suleziwetizajeza.pdfIn PDF document text
    • https://jjpremiers.com/files/27113432265.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9a132fe0---33212655234.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/54bb1e44a6d9ef5bb0ea7cd77bc2106a/8540431621.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/1ede85d6b98ac92a988b5f1ac1d83633/43399998358.pdfIn PDF document text
    • https://estoniapools.com/contents//files/41163325462.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/83018789945.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tuzexazowenevab.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/xazanerut.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/42889406735.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/2300624065.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1531bc7146a0abbfd03035468fc8ce08/91970118033.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/gimujukug.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/58576689169.pdfIn PDF document text
    • http://didula.com/img/file/tipimotuj.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/malekesanix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stoichiometry+worksheet+2PDF link annotation

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