Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f641207ae0405b3…

MALICIOUS

PDF

63.7 KB Created: 2021-06-09 12:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a1455407f653ba42060dd96d75e3d2 SHA-1: 36d783f5233d967e9dd242fde757e5c81e550131 SHA-256: 4f641207ae0405b3712718af63cdf0686f5fd5d1ec9fb800e87a4eb2fa8a1f56
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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://crewmak.ru/uplcv?utm_term=coop+and+cami+season+1
    • http://wskinbody.com/data/boardData/files/62717265028.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc2b3b838---waziburekozodevemejoxeme.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/993759ec1c08e03f18382bd124745e52/widupananajononizutul.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/qbkq38ot4091lu1bss2ejmtnpo/13588841470.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/08c21890aa464d57937961719c191b7d/zakabelobobuviwe.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/1d6d9c0f313adf7cb9732ed7d4f9a5cc/xujebajurajidisow.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bbd4ca64d---gujuberidufi.pdf
    • http://ainut.fi/userfiles/file/ruzewon.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/5104335c4e06a632d2f5862618e38d8a/70685247435.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/40894e1e87395790a1912994a6e7128d/90745443081.pdf
    • http://dichvuwebsites.com/media/ftp/file/budod.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6de98a768---datozafanaxujinigajojix.pdf
    • http://ibconsulting.it/userfiles/files/54386527429.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207fc8f7ec---wosoxev.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g6u87bae12sf557u9jst9thi9v/69098374997.pdf
    • https://heatingboiler.ca/fck_upload/file/daxujukivowonazon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef98.bin
51c540c34d54ab0960929169025626831ca65c2850476523a7f7b41d3a7dfa58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5048 bytes

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