Malicious PDF — malware analysis report

Static analysis result for SHA-256 5304c34a2785ef5d…

MALICIOUS

PDF

85.7 KB Created: 2021-06-18 15:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c724d0b68d946c5a862b8b517390da4 SHA-1: 56cb4fb7dacc18de85497df61a07a60359ec0c49 SHA-256: 5304c34a2785ef5d69849bafd0091a06014fda1a4bf53f5011bb12d70c46aeb4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the 'link farm' heuristics point towards an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/plcaqdpodfar726mghv2aard3p/ladubijered.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/32ad1c6f288361af3aa1da00773ddde7/zitedotojetikarilonebiri.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852255594e---gabize.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d89a0936fd---nazib.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/vur0s7m6ube7vaikekcq6gb1j0/dilarulikazo.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d79b6457---24563869020.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f38db5a9---weritozolakepisunule.pdf
    • http://fitsiluet.cz/data/file/16762106510.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899166a1853---72581465377.pdf
    • http://tuzvedo.hu/elemek/file/87452761204.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/foniwipelovijojonafifal.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/14cafbbf076b4b66f869ac5b13cc12a2/53028061699.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59168f571---dimuloleram.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c985380a62---xufanajarosefekikulome.pdf
    • https://myphi.biz/nbloom/fckuploads/file/tufumivipozisimowanaxo.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c6213c7fea2ef2d450414afdf7185daa/sedegamenak.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb94d07ff68---pigamevixoku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=oxygen+telugu+full+movie+online
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e735.bin
4ebf5e20a0770740a4ef3d9be5853b17769550e1016610d7f522409aa3e41cf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 4744 bytes
font_01_sfnt_off0000f761.bin
1736634fce7d6d73e502ef03d9603f2b1fd2d43a09b2f058ecfdf7c2d580aa83
pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 11868 bytes
font_02_sfnt_off0001202e.bin
a131623da5d2487fadeabafcc31b098f5bef7b1eff9e04de29d82d5b6ecf6878
pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 17740 bytes
font_03_sfnt_off00013b49.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B49 4324 bytes