Malicious PDF — malware analysis report

Static analysis result for SHA-256 825da553d19d1363…

MALICIOUS

PDF

70.6 KB Created: 2021-10-11 14:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 504c4d4df036e9b8de4972f39d8566da SHA-1: 213e60cdd5ddbbe2ec46c809583f22a70ffb46f6 SHA-256: 825da553d19d1363f1060a3eb3489a02061a064afc57ccc293f9b72d319caafc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to create a link farm, potentially for SEO manipulation or to serve as a distribution point for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5460

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://buzyhub.com/files/notawubedogitixaxufudafus.pdf In PDF document text
    • http://studiodara.eu/userfiles/files/28383576598.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e75c200a31d1c5ad3086c5ed9138cb2f/vefanogefused.pdfIn PDF document text
    • https://granitnet.hu/editor_up/vewenosumak.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/81963234685.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/woduromalujiwimujifupo.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/xafofiripetobemesinid.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/nazasitumuj.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/92025927440.pdfIn PDF document text
    • http://aweibel.com/Photo/file/lusisasoputu.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/47161874102.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/rajedafipobutodaku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dcd141a8b---muzofeb.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe66ad3209---janorujuman.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d6c5494fab71fbfa87cbf85e2b27a704/tedenevune.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/15244848496.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/fuwubuxa.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/jaxiruw.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/vipelirafizekugenomovu.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/5115395271.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/jekow.pdfIn PDF document text
    • http://schubert-hh.de/image/file/momomopeza.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/wewati.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/bizitezulurubumudugarep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=halo+books+in+release+orderPDF link annotation

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