Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8da40647a0851c…

MALICIOUS

PDF

75.4 KB Created: 2021-06-15 12:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b430d593ca6a73168abf4c5347acd9d SHA-1: 98bdf8aa7cf836fc37efc23b97e0d29a43305540 SHA-256: 9e8da40647a0851ce04a13fafb961f8501c6eca0640886e941745c6d1b35eb22
156 Risk Score

Malware Insights

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

This PDF file is identified as a phishing trojan by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://garglob.ru/uplcv?utm_term=quran+tafsir+ibn+kathir+english+arabic+html+pdf+free+download
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3a0da5409c07f8aca6f25b47c8bf62ea/zigivufinapuvegalu.pdf
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/88540195183.pdf
    • https://digireg.pl/upload/mepawuniremisem.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1c9407cf3598864a9fb831fc1d11908a/jidezerale.pdf
    • http://akicgiyim.com/userfiles/file/jeduzaj.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b188945231c---birewugizewalunitewiso.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986809a5ee0---31501260704.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1a6c1efc---60395407677.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ae6sbpeofp3l1cj3ifu06gqf8d/zajevefawozutivowiz.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/85716054952.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/692obh523ginbk99daftjihdd1/zezopuvarokukur.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/2vquqkptdhav3b2krrhbb8ihs4/gekumerenusodevupejafalo.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f5e6d397---perivatifotiloxuz.pdf
    • https://art-lamps-rali.eu/files/file/85704484023.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c1.bin
43cad5ebb26d69856750b9e800ad6b607ccbc33cda37e5f4131c61fb328bee82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 5928 bytes
font_01_sfnt_off0000fad2.bin
bef1249ebbaab5e5d696851bdb55ff7d34a5d6879fe9c7bc0738a376c6313179		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10936 bytes

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