Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd31f839ca0eabc…

MALICIOUS

PDF

58.1 KB Created: 2021-09-04 15:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 064391ee7b5b8ba15b351ee279cae72e SHA-1: decfbc15e0d202b03ff31e15fb84cde5e8de7378 SHA-256: 3bd31f839ca0eabc1d28b610bee4b15667410bb78f75b041f449c4e3d0e2f841
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6988

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 http://studiosiciliani.eu/userfiles/files/78874101825.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5ad1a00f---10768106482.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/80248063393.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610410ac4d8c9---wusebomuwofiwaweti.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/67344683865.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/kizajanovenuzuwaku.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/nubagezijapokoradi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a764d332e44---voxirazeji.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821f6753d83---daxawulomipigipusuza.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/sulamofifanofamafemi.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/25260762315.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/40271162511.pdfIn PDF document text
    • http://kelvista.lt/images/files/24827497034.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/oksf8c80s3a74snt57qifum216/60186510999.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/76896288110.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/lazonumopiwenufisasumuguv.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b45bc86a779---jelejixilozidivudojoveti.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/5619072485.pdfIn PDF document text
    • http://ezibra.pl/upload//file/bagazupunagumemesetadebun.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/temejidibe.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/79746245781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=uses+of+natural+and+common+logarithms+pdfPDF link annotation

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