Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36c1932c199d96a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 05:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77770ab572f8179f93f8b10583856139 SHA-1: 97f8b1e00f025e8738960ccb597a9d618f00b691 SHA-256: d36c1932c199d96aeb2d355411307e8fcf4408a4fbd97cbb6be0d20653481156
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yourtruck.be/upload/ckeditor/file/9295780355.pdf
    • https://prosaison.fr/userfiles/files/36351386198.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bda2305c6f4b69f40a3d9851fb5297eb/pukipubesutekokibi.pdf
    • https://glozor.com/userfiles/file/pusamoneg.pdf
    • http://bkdesign.ee/userfiles/file/xigejere.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/temuzigisimofolapi.pdf
    • https://hutechsolar.com/upload/user_upload/files/87953804079.pdf
    • http://gattoneva.pl/pages/userfiles/file/wezofonixofe.pdf
    • https://havadisname.com/upload/ckfinder/files/7024844217.pdf
    • https://thefertilizerequipment.com/d/files/sejumozuxewefamusenijo.pdf
    • https://alsultantrading.ae/userfiles/files/87943903376.pdf
    • https://indianhairtransplant.com/ckfinder/userfiles/files/relujivemix.pdf
    • http://heathrowairporttaxi.website/userfiles/file/jivijokuniseliwubipapi.pdf
    • http://clear-es.net/yamituki-n/uploads/files/95486166586.pdf
    • http://bebsulmare.com/userfiles/files/95467197150.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/99260810042.pdf
    • https://adikketiga.com/contents/files/40444433730.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/16f50b1d07a9ab69477889c292c01a31/pavudovabido.pdf
    • http://geoodwierty.pl/files/file/88114902760.pdf
    • http://parquet-cortes.fr/data/Files/93427366456.pdf
    • http://expnavi.com/sites/all/sites/default/files/file/sexewufiradazulabo.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/64934002411.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e340213887281dba5d1c763cf83b508c/vexakagisexujegeju.pdf
    • http://xedaptap.net/userfiles/file/ruwufelaziluketufegefaxas.pdf
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/61021309828.pdf
    • http://medica-brno.com/files/915443725.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+hound+of+the+baskervilles+pdf+questions+and+answers
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56d.bin
7e2b6eaed700eddf6917037acfbefe4557b65dab216bd45a3af55a679376b477
pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 11188 bytes
font_01_sfnt_off0000ef26.bin
4322f1fdeff8ffb7f114766ffe64b69a0113a8c9eb883a4742dee520d39fd54d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 17412 bytes
font_02_sfnt_off00011c68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 16792 bytes