Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d59f91b803db0c7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 20:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f939752832bd6226ea472e22e3dd5a7 SHA-1: f0f5ab54129606e517cd1bb4b7b32a8a0d4b60a4 SHA-256: 2d59f91b803db0c7b6d2860a069e759359c22874e3b510a6d1760764a1e0a479
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to websites that appear to be part of a link farm, with some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a lure for further exploitation. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=normalization+database+example+pdf PDF link annotation
    • http://likebarcode.com/image/files/20210703_182139.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/rasegefawa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/komekipomesina.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/xaxoxeronuvobejosaz.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/30665857544.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835b1bed626---73353404557.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/maguxojepurazuradukep.pdfIn PDF document text
    • http://axwelindia.com/uploads/8881193683.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/32299338308.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e6a7eb266a25001400e9181aa9756318/nagudenik.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nedajenavebakapaposuta.pdfIn PDF document text
    • http://soupworld.de/upload/file/xelunilozobuxonipo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3c0b77c809bb41d92e1e5adffd2274af/kanagozat.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed82d352c---dofawavijadejedid.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/pozedoseretago.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/sipajokadosemuvutu.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/6114347249.pdfIn PDF document text
    • http://tion.hu/upload/file/lalezelalilisugun.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16094083b98aca---tebozarivonabarege.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49650440cf---30326123814.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/sazegidunofojapoxoxexim.pdfIn PDF document text
    • http://tianfonmm.com/d/files/50155873966.pdfIn PDF document text
    • 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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 10936 bytes
SHA-256: d0e6292412fe45d9acdd4ac84a104eb2ebdc91420f9df603a836387d62e7206f
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 17052 bytes
SHA-256: b57be4df95efdf01a7874f24e7a4983008eea2194a0bd0b1a06d99d7205a12e7
font_02_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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