Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4cf544cd69cbbc…

MALICIOUS

PDF

62.6 KB Created: 2021-05-16 17:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d19040fc10b9b028514bdb65758398 SHA-1: 6a0cdbbbbfab165fc688ddf7de9161c7503e3bd8 SHA-256: 9f4cf544cd69cbbc88369580dd2cf7182b24dc8f6369b664c7c826b1e241c223
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d979c10d63---30035717582.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609661d1da328---mogigumifowize.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7f78829a---xisaxulelatuvodavut.pdf
    • http://ferrogep99.hu/static/media/file/26241342268.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/61491ff81598c69af13908fe02678915/80019730894.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7d4b8d31---keboxujavifuneguwu.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d1742e88c7ff62ca9e2e6c6f584f1b21/mawabuvekotux.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/v2m5j6u9i4uqs3fmspdnu413qb/zolosafopusinirema.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607feee17bca0---43671758558.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/931e13i59vcltrsi47p4irtm38/xasotiperolunonudawibi.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1fdf831c4---19105213207.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/95b824a624888e010d1a803cc745f066/bidew.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ci47ndq83d7dpr71tdvt8btns4/5128242936.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/dde9d2c74344fcfabb7d4ec01c8c003a/22969211997.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m7pqb7irnu8k06cq1njfimsk76/45313006916.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=remedies+for+infringement+of+trademark+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e738.bin
ed2d7d17a2dfa0c511ff1156b543bf4fae6734ba86de729cd44a2fb0d0daf898		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 5400 bytes

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