Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a79264379d67d84…

MALICIOUS

PDF

77.7 KB Created: 2021-06-07 02:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e82f2a57130a1f7e6a82304492e8a7f0 SHA-1: 0249ca4ab515e20d420f4f20c3b907f830d868bc SHA-256: 4a79264379d67d848e6ccbf5a445da4e77ec5530bff0bdf14027a73137878eca
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 hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily garbled, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external links points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

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=texte+ulysse+et+les+sir%25C3%25A8nes+6%25C3%25A8me
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160967eb0ef9e5---81616973425.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa868736ce---zodozefuposogimofurufo.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/500f8e576576af42950c5753b8f46284/gorazikun.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160971444b47ac---9408721485.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/db3gnurhvbnjmp4ve3q5rolenp/45110668757.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8bedbf993abc55dd737138a7cd656f1d/pufim.pdf
    • http://dermalab.pl/userfiles/file/66039023163.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9ca5d9a73---musexol.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/51621614530.pdf
    • http://fdscience.com/UPFILE/userfiles/files/mumasus.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6368ba374---520546809.pdf
    • http://mwflower.com/upimagesfile/%5C/26477837264.pdf
    • http://zulaikhatextile.com/userfiles/files/xobinunimubivininedefome.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/bba95286b1c2d796902c801d48b62934/mafixebevutafefanege.pdf
    • https://marosme.ro/hirek/file/dofuw.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a90cec3804b---48931819923.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_off0001199c.bin
6acc2a0cc6237f0692db940718ce7ae67ed197d9197de0f6961db4b77fd99258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 5036 bytes

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