Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c59264902ab7e3d…

MALICIOUS

PDF

98.7 KB Created: 2021-09-06 13:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8c8e616424835287951212dae34ec8f SHA-1: e9dde01db5dd2afaa154f928544a90ad7b1bacff SHA-256: 0c59264902ab7e3d1b554a9ca864a133511a1cd7a46541a620c5b3578fe5a6c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe9b0bd9c---tiwamatavazox.pdf In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/68d09f6752049ae8f52e50c664bed3f0/nisoranerepexewe.pdfIn PDF document text
    • https://wecareprogram.org/images/file/xiwobulaxen.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16077092785251---2797938592.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dikojumujitufokujetaw.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gk0conp7a8b7a5t1tj9hhcg8at/9710837828.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/livififetodurerike.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b570e162ef0---tekuwixi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/93478381170.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/36502234496.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/af86bbe46ac8bcf62588ff9c1971cea0/96721574500.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2a0b3435bcd476e5fae9175cab38c711/bopitevugepekizazaw.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c3afe637bcadbb78d68ce4d9f8b563ea/82672636918.pdfIn PDF document text
    • http://selidbe-beograd.info/files/16355068347.pdfIn PDF document text
    • https://ptogel2.com/contents//files/87612979136.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/mapukijeromavepib.pdfIn PDF document text
    • http://atcotourismtravel.com/userfiles/file/85904960304.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/waxiv.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/bizemububobawakalido.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/vanuloxesojowisufa.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/tapiwi.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/19452893407.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a753a4d3adce0f6813ea8d700b051749/getupuzukusugujerawopiwu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7e128e27d92c794c8c1f3c8fea7728cb/zigevirafavozud.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608015717ffc6---kegupomovomebokur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=neutralization+reaction+problems+worksheetPDF 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_off0001158b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 20004 bytes
SHA-256: bd687917c45e97dd97353750448eb5306f1318416fcf6ab08bebb58d4064e40a
font_01_sfnt_off00014969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16180 11092 bytes
SHA-256: a3bce8e2a7ea05eee828efe7fa8e3c762263a833513eeb6d91d7d6c31b895e1c

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