Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c1b88811b0f521…

MALICIOUS

PDF

47.6 KB Created: 2021-06-16 01:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: da88a69954286691f286328f8a2519a2 SHA-1: 6f349aa06ef39cb22082b3904cd5de15a7e88f10 SHA-256: 40c1b88811b0f521fb87728193a9348f7fbe6c95f171d13ee620c1020c26978e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically phishing or trojan distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7172

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://cructi.ru/uplcv?utm_term=hip+physical+therapy+exercises+pdf PDF link annotation
    • https://tidaksusah.com/contents//files/93602569625.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca0f4fe1d---kegotomebuve.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7e5acdb1ef8103fc9d0555550b670815/zesurodopejix.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zowuneramabixenebepuja.pdfIn PDF document text
    • https://ahha.az/userfiles/file/3884256692.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a395ddad0b23c40cce5e59b45654bd3/wufokanodagij.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c2e9c5db8d318622453f0983a2b8e46a/xolofukekesufofonipubeba.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1b0120c6---55754331853.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2c228c930c2e7924340bf5d1cae2a851/narixajupatok.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/416e2a01675bcf0aff78dce2d5a8f4bb/67439228607.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/72610863262.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/dexativalozoxupubupe.pdfIn PDF document text
    • http://candientushinko.com/images/file/88093857255.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/e4gabujj4176rlsfhprc1uu6u3/17059260952.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d95e807be---13729228999.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/seqn2j57helgim29lm5c6sb3c2/muturuwufuxagebikotajima.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c852cbc7327---rijerimonipopevepu.pdfIn PDF document text

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