Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2d7827b9764b6a…

MALICIOUS

PDF

59.7 KB Created: 2021-04-14 01:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa1bebe4aeca089ca552c768a5d8e56 SHA-1: c94f3bf20d01276388015bd4a78bd179c532ce70 SHA-256: 5a2d7827b9764b6ab674680450f50ad208411e9950745d3f1e379651f7c3f4c6
94 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites. The PDF document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than a standard document editor. The presence of multiple external URIs and the heuristic for a 'link farm' indicate a likely attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4986

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://pilgrimland.com/sites/default/files/webform/resume-uploads/64296936159.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/16831560309.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/70645978292.pdf
    • http://www.friendlycc.com/sites/default/files/webform/74296331991.pdf
    • https://ambrose.edu/sites/default/files/webform/28961662769.pdf
    • https://www.jwico.com/sites/default/files/webform/kupoxogij.pdf
    • https://www.blplegal.com/sites/default/files/webform/58709767715.pdf
    • https://web.liderpapel.com/sites/default/files/webform/36759883892.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=god%2527s+generals+healing+evangelists+pdf
    • https://drones.princeton.edu/system/files/webform/janewif.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4fc.bin
39a7165da798e60572369b1c43530b6a59d129327da738a22d4f1c2e88c4d873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FC 5216 bytes

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