Malicious PDF — malware analysis report

Static analysis result for SHA-256 f798d21de0fdf665…

MALICIOUS

PDF

51.5 KB Created: 2021-06-05 15:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1e95354606da5d1e7c7b9ef1809a0557 SHA-1: e04e84f6241f0a6f90f77f3fd18763c4c62c4c6d SHA-256: f798d21de0fdf66527fd0ef85a1a5d8a2c915b9be390e6f39979fc75a9a6420a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the heuristic firings indicate the PDF's structure is weaponized to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7011

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://medvor.ru/uplcv?utm_term=how+to+clean+a+taurus+24%252F7+g2+9mm PDF link annotation
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/386817256730828320d73c23c1c3bcff/79501879272.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b061099b334---buguwurunefoxuvubo.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/12kqkvf2g13uofkfn0av51gv4r/94477710232.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0adebbd45---segitifudugoza.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a790f546d6bbe39c3e4519e3c259ca55/dowidokimiliwos.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b9f71513---derajibok.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/20024522621.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501182332194.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/daae08996c59d95ee5c4ef08af54e3a8/9351315213.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/sisisipijovivixofelat.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/nbecdctpc39u18u2agn5f5a5sr/posozeposuwokejo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a1df022db80---tosizimigopun.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/k6rbaua8ckgfk5659rg513okf6/2883247637.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c731487630fc56a8e59b27b19f680573/82954467838.pdfIn PDF document text

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