Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a09cfb2d5cce56…

MALICIOUS

PDF

64.8 KB Created: 2021-05-12 11:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a042ef8992d1267460296c231c28ce8 SHA-1: 920c6506338f27b8f917d95c0cb18aefaa747b75 SHA-256: 96a09cfb2d5cce56fa485fb2d403c9273747b3f943f1c93ec1a0f675469fb795
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, disguised as an exhibition invitation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8968

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076220d2df25.pdf
    • https://agentcctv.com/userfiles/file/jovavukapus.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098f6d55b630---90216995427.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607749584ffde---16864115984.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3937f5934c6e66c4d5894454da490762/6738022449.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/77586535551.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7ba27b98d612bb7a3986f39f66ff22db/vogidivakufepojesag.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45c89bbd9---zogeziki.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cfcbca292---sipuvufamegozilikofuj.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/umij65qj4c1sog2ejavqmqo2h2/telefabem.pdf
    • http://frezerovka.by/images/fxeditor/file/51505692769.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086386e0a4ae---82559467213.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160851fcd30ebc---vabujux.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6i7cct2td886hq6rs8i3p2t8u0/66875923843.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=invitation+template+for+exhibition
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f279.bin
805bb28c00994ddddaeaa0f243280bdfe8cc0d335f70d1184131600eec3977a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 5168 bytes

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