Malicious PDF — malware analysis report

Static analysis result for SHA-256 be95dc66e44e5d8c…

MALICIOUS

PDF

64.0 KB Created: 2021-06-10 20:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e745117faec57bd537b1925d83b6163 SHA-1: 05757965f18c424ef25a7c223b59de09ed079994 SHA-256: be95dc66e44e5d8c6d02e475efb1c4c442a04731b4e44a411d40b3203f2199cb
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=bar+graph+dependent+and+independent+variables
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c066d21fc86---tirovudedudugopida.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097afaeef872---10250736036.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f671e08f3f---rugiwupifewapux.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3a68b92e3472139386d27a53ab3b9dc7/82055789118.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cf1fe5cb24c10c1bb7bcb0d7bb79adc1/44926869222.pdf
    • http://hongdacable.com/d/files/vodasavopugo.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a1600c63f3b51fbcf7185dc1dac0992/83316834399.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf16ce207---27257721574.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9cd60a9c04ca5b9a59280f0d1382c29c/21492915765.pdf
    • http://geostudio.eu/userfiles/files/tedisurijeta.pdf
    • https://akproauto.com/nbloom/fckuploads/file/60009886275.pdf
    • http://t-p-fortune.com/userfiles/file/revewajafokatomapoku.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/id706h6c2ntot95c156b8hkbss/xorexusuniro.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_off0000e90e.bin
39299b3e4594dc50e21ea30617118e6311544e4b234e67cb86b5c74701da45ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 5472 bytes

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