Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfa25b562308b57…

MALICIOUS

PDF

64.0 KB Created: 2021-05-28 05:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8456c6ab8a9554b109922a5db94d85b3 SHA-1: d4cda1801dada063782678dee3d0e73a930bb8cb SHA-256: bdfa25b562308b57135229a7adcdfd90216fb02a346055c75f474c6c9ad8dfd1
154 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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS uploads. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful content, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8428

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=gemcraft+chasing+shadows+gem+guide
    • http://insidethedigitaltrend.biz/userfiles/file/kabitonikegoraxonikegaf.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab825b74d---18443438988.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608829baa32fc---42093947749.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/6984a6a109b37f8e690ccc43bbf810e5/zunomul.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b6609daf---jadetajab.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hvr4octlq0rn94s6v31vbh1kj0/suvamumezirozorurukep.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9037c6a6e6bf87b892d00e718375d7b6/wetilikisomo.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/23dd80b9c6cdae26c2701cb12c311f6f/bajevafonit.pdf
    • http://computer-rudolstadt.de/upload/file/tamotezurojotu.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c965fd84086de4530f0231c7d64480a/25629768292.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce75eb2a2---76826700951.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7836bec71214d6e21add762019aecadd/99760140245.pdf
    • https://muzeumkonstancina.pl/attachments/file/75516457730.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/pokogo.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160985da33bcb8---24770400049.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a6bdba621d8---82543431340.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c77951391---5888794811.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6f9390ae8c28e499b1071d522fff77ff/95856139359.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/49270931308.pdf
    • http://shuswapladystriders.ca/userfiles/file/wuwovuposupoxobilobilake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ae.bin
b8c09a50b85bc75e3efcc531943289363eb7beaa70f6fe6b537dd4ab2136c6f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 5408 bytes

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