Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ba001ec7a62850…

MALICIOUS

PDF

76.7 KB Created: 2021-05-27 07:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea19a78b002493a20b5f4e7fdad7c068 SHA-1: bbc950e7171508f133cc6ee4668cae864d32d8bf SHA-256: c2ba001ec7a62850ac0f297bef7598830c6f15b5e911294b17cda9dc89a678f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or engage in SEO manipulation. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9755

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/32e53e1eb0dd84c241f144f50cc11d10/61762649950.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c1aa3521---89929503430.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/09d957b12a9876abed500a7ef80bb5f5/bupore.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4ef1c4e5---fefulefowevewaketogamumus.pdf
    • http://angelcabrera.com/FCKfiles/file/60383176774.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2a4e5a95---runewakugi.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1253159479c66f1a10f6818a92d73b96/66084851246.pdf
    • https://ebooksweb.net/files/file/gelepiwiviparigumumuzazef.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/87593458301.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/33e5f819c01ca8480de66dad9f041c3c/20190801154.pdf
    • http://sivam.pl/files/file/mebegorifusasu.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2ef0752b---84471535186.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c2a5b9039550203c166fe4504e06a178/vifojidifavuperez.pdf
    • https://usssecuritate.ro/userfiles/file/waxogijaxogovek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=warcraft+3+reforged+freezing
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b3061daad---sezefil.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f320.bin
f881060d4b3e3b076a210158f2a830883e564bf70724b68e0cfcea52377aaf12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 5208 bytes
font_01_sfnt_off000104fd.bin
bca0dfcb8a05a2d4e65e24b3d541a50e619bd44b0475c35a3f4cdca097f045fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 13692 bytes

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