Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbe6c031746396b…

MALICIOUS

PDF

79.1 KB Created: 2021-06-11 19:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6e545e9c73dce2b114f29ba4e143233b SHA-1: 2219019bfa24d6029111c5c3665aa1440c538749 SHA-256: dfbe6c031746396bf34fc63314bd18477b4d0f19cb00e7a7f8bf169bf2161453
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious PDFs or redirect users to phishing sites. The presence of 'utm_term' in one of the URLs suggests a potential SEO manipulation or tracking component.

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://irlanc.ru/uplcv?utm_term=2b2t+hacked+client+fitmc PDF link annotation
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb241b576f---pelemomobiregev.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bca4991f55c---64781121469.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/terijinekisafiwidowix.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0653c62d2aa22b847b90bae176df23e3/47498612414.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ef8d7797bd0731681de3e44c86b4bd9d/42707459229.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/de3d96aaa2e5662f92216135e4ebecdd/75346267463.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/731962288.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/37401960407.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bpdstsskn2kqh48gmidm18u4rb/3912190405.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/13887256865.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/zuwegufekurusafurobagulu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1ec0918or38ru3j5ofr4el0v0h/19178301800.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7ea6c2c829fe0bed3badf9ef6df41c82/23411590955.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c44683c5463aee9f7404eb7ce18c0f2d/7421592267.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rsosencnn51r6e1n8qv8rf6d3b/37421497512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 5228 bytes
SHA-256: 7e7dfec23b80faa3e185341e9c61547068bc5d1cdc7b369152dd1fd17526f814
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 11556 bytes
SHA-256: 213d4cd90bf828f57d0c616251bc9be748da7af0c3c6c11c417f111adacc87e4

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