Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff81e9fd5889f120…

MALICIOUS

PDF

99.4 KB Created: 2021-06-10 03:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4ba09c7bf53d25cb522a55a0a4638042 SHA-1: 4ffbdb8768e0e2afcf8c72617cadb1dc45849c2b SHA-256: ff81e9fd5889f1201c9b7567d1b33570f5fb0fb239084104dd89ad08394ed7f6
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9306

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 https://ketchas.ru/uplcv?utm_term=gta+solo+duplication+glitch PDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928dee2a095---wiviji.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609472d576781---sidowiluzosuvu.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/29487064724.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cc548ff5---80577708322.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/aad360dea221c13a4edaad93a98fcc24/86243202111.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rg2r6ctnnmofbljj17jllqsd8e/60828474406.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4de29a542---mazesuluxanofikeda.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/crd3cdufo8vhkg8l2pfk87ne05/rupabutagobabedudimuf.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b42111b2ae3f1139f7bfc0b9d5a1f250/vevopopo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/dg62c3um2sa9g9i60m4r3o17ib/98501255187.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/jisufokitusivut.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/94514932942.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609024ea80af7---86495759840.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b281173d2d0---3100124587.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a8723e65---19228083286.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6d60daefc016a800e6281d9f74fa36e7/dujutomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14334 5036 bytes
SHA-256: a0661082d2821b3f223a7b9564779a300704fdf631d14e918657621ec0322da2
font_01_sfnt_off00015448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15448 13224 bytes
SHA-256: 991c4b8ef8bc56412480221e29272c2823cd1fbfd5c477393bfb142cc7801e80
font_02_sfnt_off0001808d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1808D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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