Malicious PDF — malware analysis report

Static analysis result for SHA-256 6986f2004d32c701…

MALICIOUS

PDF

58.5 KB Created: 2021-05-26 12:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed576e9e176f51619e67619f14b49535 SHA-1: f66573e33e162058a6b10c5b5c6ca131a9fef663 SHA-256: 6986f2004d32c7017d32f26fdf56a539306e87af22469ff02dbe661465a7d6bb
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with deceptive search result lures. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8067

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://irlanc.ru/uplcv?utm_term=lengua+castellana+6+primaria+santillana+pdf+3+trimestre
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/77c5a932f67d6fe01aa502642571e54e/zabevadajodiko.pdf
    • http://www.asslar.de/downloads/resusasebelelelataza.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fi70fubjfqk8j3sdutidgaia3t/5425028602.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609bd57c18466---mukagakexuxezokiw.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/qf7h189shthtgqqfm29o61ah02/58365592705.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608989bd38dfa---vetijoxuwab.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/51a61b623563503497dba4d48aea001d/kowebimomifosa.pdf
    • http://bajajsports.com/userfiles/file/70609096113.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073df5272f8e---91221096797.pdf
    • http://paliukenas.lt/i/File/60960425151.pdf
    • http://provia-events.de/pics/fotos/1/file/fawutigiwirovi.pdf
    • https://aulacvn.com/upload/fck/file/225900658.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48620d9b1---kewesavufuru.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90c7a6fe9---67258525102.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_off0000bba1.bin
7eca788c337ba84fdbce9e6936e3b2b35d7aa7ba454cf2663a8485111af63fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA1 5736 bytes

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