Malicious PDF — malware analysis report

Static analysis result for SHA-256 656a2d57081b5096…

MALICIOUS

PDF

61.0 KB Created: 2021-06-10 11:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8979bccf7797e2d13a21e923fcec974e SHA-1: 628e37f8e16604db21c80def196ebfca310f36f6 SHA-256: 656a2d57081b509663db0b585265fe6227d1951fdd6102102df36d905fcb7e46
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'wwe 2k17 free download', indicating a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8323

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=wwe+2k17+free+download
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b34fb7f06184dba6cfbf335c44dd8a4a/mawusada.pdf
    • http://igabana.com/upfolder/e/files/20210610124443.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607affb4df86e---watojijawinukoxafup.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/176190f7b35edb66a8fc275500fc6af8/33825902625.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/xadefovasuburawe.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/605700a2b099b6c45e9be64c6dfae23f/xugonojutivimuleb.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8dcef14e---woxisejo.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/xofulajemoja.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8kamjhbfk4tq7jm7rghh766hh0/97006375951.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a8f070c8c---39449429334.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb461f85c---wabigemeveloxowi.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfed03d23---lidatixam.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1d99a7f8---23609893986.pdf
    • http://mesterek.net/tmp/soligu.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_off0000e758.bin
b79d77cc6694322d480640924c9cfdbf76a3acde043b5d9c7f2feaa936f602c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 5156 bytes

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