Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f87967ac931f3c…

MALICIOUS

PDF

54.7 KB Created: 2021-06-19 00:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 70073a9c4f8d1022aa6392148ac93a7e SHA-1: aa9ad1e9616a8235ae419ee8102796bd078bbd70 SHA-256: 42f87967ac931f3c86552cfa1b1d0c9d97e7aaa666e0073b4ecae6b13f216df0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7444

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 http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vubifesemivuxoxakan.pdf In PDF document text
    • http://guoyangmoju.com/userfiles/files/lepav.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/dpe23elcniio588omubl72bfr6/dagubago.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kenokowarufesamerokewu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cc5a2c9986cb7b4057d5a4db1faccd30/divikezopemiban.pdfIn PDF document text
    • https://coil.hk/upload/files/redafetivuwetorugogud.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p9amtsd25sfn472aivnbtkr69l/80203669599.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609264f0386ec---xoxowekuvip.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d1fb4f54---25876208693.pdfIn PDF document text
    • http://garderoba.sk/images/_file/texelijonav.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lidt48n3n0eefg68sfg9fp74ud/92165877183.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/galowavigi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/609d926df8167c65f0abda2870fb89b5/63178116621.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607849654882b---jizegoxafapuzizi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16098df6e7078f---pivamobarinonugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=reference+format+apa+7th+editionPDF link annotation

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