Malicious PDF — malware analysis report

Static analysis result for SHA-256 9facf73d3ecf1664…

MALICIOUS

PDF

99.8 KB Created: 2021-08-03 12:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b95e4a8598a0a9fb4274b0807ac950c SHA-1: 20020a5892c055afaeebf4dd462c6aef1a3eb4df SHA-256: 9facf73d3ecf166436031e892cbfab344ee9a5856b0838cff9e837f3293e925b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV and ML classifiers indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160844c00c9035---17697516762.pdf In PDF document text
    • http://highdesertrent.com/newsite//images/uploads/file/82274229449.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e1qcbslevmql0p0tsv50i0khrr/7655913749.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ohids53bdn30g0kgddfam9rjmf/87477182515.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/95737998270.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609191fc8026e---norofawuwusonudi.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/lipuzirisusebukamoxu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8c8d46904271f6e643e9637b9947bef1/92479965441.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/23845470007.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/49390200371.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/682116e0bdcf4e656c33a4f6d0556c04/zezudokoz.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105030222421505.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6a55529e02338569ec20b5d9aca46d4b/69378590824.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a935a695db1---97821867062.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b94931de9---vatevatuxedepat.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/97747353302.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a7e177499e9670cd6d858deab6e954e1/xaviralepeveguwisabax.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d67dad91---xirebojudowisagimanu.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/94953294345.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/0ccd887bdda22fa520f62a0824db1989/64508932648.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/bofapup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=guion+de+teatro+los+tres+cerditos+y+el+lobo+ferozPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 18792 bytes
SHA-256: c0f780d06d57d04d7147d5562f39077a378771f7794f7c9dedec7ffb2d34dd14
font_02_sfnt_off00016699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16699 10920 bytes
SHA-256: 615060cd430be662bea29b3f8a644a85ac51641d94d3c1477518524efb12e18c

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