Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ade93251cbdfa5d…

MALICIOUS

PDF

64.0 KB Created: 2021-05-13 16:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cfccf08e577b3af23634cc75945cfdb SHA-1: d729095456d806a1f3a4459acc3286c054099f85 SHA-256: 2ade93251cbdfa5d538c2f7a122006e125109e8036723fe673aa234d610b32b4
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leveraging a technique similar to T1566.001 (Spearphishing Attachment) if delivered via email.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8695

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://philabc.ru/uplcv?utm_term=google+docs+newsletter+template
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mu0f0ovao9261hn7u8vg3l1302/70404984210.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/202bd7ff5ce020ab986632868de7b419/47421004465.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/8v3e0qbbvj86su2iuei54lhqom/mevizepa.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6cdcc0489---sasamiwikegajofexizitanor.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fc7822b9---luxexugawavopaponasubozul.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607344f585af9---75027047283.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2a1128dceec67b1372cdea19f6061e2/89988078212.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3ea41df159cc128638d9d6bf99bce377/48358565868.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160710f86b4311---wumepopowadogenuz.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43323207a---fagatamigesabuxi.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa4103eb8---99872066797.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4d187bc3---30269507198.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/21867945212.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d201.bin
63dd93dc585954e836c849ed195b69f0416cb1f450a0c2e7057b96bf05a5e1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 5516 bytes
font_01_sfnt_off0000e4bf.bin
a0e33073f56fa654dab148df0885b7a6c442bd86be1c25cc4c255acf5b7997f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 10040 bytes

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