Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c1e1b1ba6f74d3…

MALICIOUS

PDF

65.3 KB Created: 2021-05-18 23:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b7e8826fa10cac8a4d91ae5c1f798d5 SHA-1: c549850e659171b261fa2e7303e84db410f19108 SHA-256: 85c1e1b1ba6f74d34454fffbeabb251900319ae5557b01cbecaa7eb6494ceda3
154 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute further malicious content. The document body, though heavily garbled, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

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 http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a37918bee---xaropagoder.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c15f26b78e---71000741840.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bba9ff884b086098d71aa1462eb8c8fb/5346028797.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb8e043db---narudapezamugukanepuxak.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160812377b1f9d---35052424228.pdf
    • http://azizolace.cz/images/file/safitafavafafiwazedemuxo.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b080778b---46196197407.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160723ef8c136d---tazozaz.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2f3f3e76---rukodomazuketili.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077035ec34b3---metoludoravafetisatader.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3975da9cc45ff0456e96846e5d4a36d0/76909823005.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d2a69444---96979449256.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c4eab4999---kaforobunu.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/efbc05e0175c401693769e6ab90729f9/xiburulodujegileforad.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbb990087---sixusemajosadadodebaxotij.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608459cfe74d4---wumojudojigudunewanijoris.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec494f04e---69266303756.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160980e9c1626c---kawanuzezogawikifa.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/6r3g2guknu37macf6j9ospcfjq/16267252792.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=diccionario+ingles+espa%25C3%25B1ol+oxford+pdf+gratis+para+descargar
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de03.bin
fb541b0244c313796f77cb9c6a68238405ba20461fe7b494ad9f4bdf3f068f93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 5600 bytes

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