Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3b779a34e0e7fd…

MALICIOUS

PDF

77.5 KB Created: 2021-06-06 02:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 032607af1a3fce2e82b063fb6202c4f9 SHA-1: 387072a150202bc0a12cc4de22f9dab63b223732 SHA-256: 3a3b779a34e0e7fd2818a45452a36be253ac35530996d6bda0cfc7a1e2baed7a
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, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or distribute malicious content. The embedded URLs and the document's structure indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8745

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://allytemp.ru/uplcv?utm_term=que+es+el+movimiento+circular+uniforme+variado
    • http://auxerretv.com/content/public/file/92152413494.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37fc635ce7---nozupaxuseloriri.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a4a205ea---vizirokisezafaninoxas.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb51d2b9b---fojigurena.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9de5d4a6---91740415954.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4e4cf6978b43e6c1d86bff559a2dd504/18977696538.pdf
    • http://akinmedikal.com/uploads/file/97654958383.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03688a4d6---83534810109.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/75929738619.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/wizowakaz.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9711c0de49d4886d93e72c2968a36e3d/66118888860.pdf
    • http://wadirumshootingstars.com/userfiles/file/%5C/35670405469.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6ce10d45f5ff2fdbf2206287e2501b2d/86522996584.pdf
    • http://anatolianlgs.com/userfiles/file/29239933390.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/496727891b1d4cc5a3dcb45fa15b9913/debebasaravuvan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df57.bin
7cedd89a995792179865b046d1bf5de19c503b0a9da303ea1dce52d3c9f3bf3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 5172 bytes
font_01_sfnt_off0000f0db.bin
2dded63e26d586e1bce38d74d7e55ea24a9b983827fd20a809d34989756d69fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 12352 bytes
font_02_sfnt_off000119b3.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 16036 bytes

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