Malicious PDF — malware analysis report

Static analysis result for SHA-256 904e729bd9a31d7f…

MALICIOUS

PDF

72.4 KB Created: 2021-05-13 05:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8fc506cddc42696b8b0d63b1748ee8c SHA-1: 5cd68a12743f2e18d6e473b9b7f7632485aad91f SHA-256: 904e729bd9a31d7f451b3c68fb57652102ca101b5a55fcbd413a0c2d58886f25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs and the PDF structure indicate a link farm hosted on compromised CMS uploads, designed to redirect users to potentially malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c3fb501dd338df1fb1a771d72091b2cb/62255434569.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/027978c4aed6279070ce122e63a195ff/86262447820.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096981c41e5e---juziwaxotawud.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f47042c6---borogexafetepudigofemaf.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783b324d2b5---mepisonawitu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c24a75f20---40002952275.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949cd77a9e2---87135744867.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/bttsuiet4bp397d4vohfafo4i0/towojodi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087375cd0d5f---96811775705.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f1c0d7e3---97383215564.pdf
    • http://augustaelectricalwork.com/editorData/file/nigek.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/22acf1d6dcd4610a09467fc56da631e4/wasutekotug.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/076l5kjroshc4isbrlo9oidj50/zutilosojadulilekuzebak.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b963e999---66048712202.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d7b159d7---gaguriluzijafaleg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=blastopore+is+formed+in
    • 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_off0000de28.bin
1dd88b99da74022e221bd64dbd52c8632e86ae14945b35613953755ecad0c596		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 5236 bytes
font_01_sfnt_off0000efe3.bin
ae767d547e26d8c4a119031d09e7e34b2d69c75bc3ca667c45b9f6ddd2008641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 10892 bytes

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