Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f33a97d026165d…

MALICIOUS

PDF

90.3 KB Created: 2021-07-07 16:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bc859a83ba3896a422b29758adfa6239 SHA-1: a881426a33b5cfc106d205d2913d94b734a36f2b SHA-256: 10f33a97d026165dfa144054cccba3bb312a8bd555d4295736ff43912f3fc495
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pixomot.ru/uplcv?utm_term=level+up+quick+witcher+3 PDF link annotation
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/75066efe6f964e3c0f8006b95f823310/9105817247.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3daa3642a9939c6eabed3c0ff628c7b/xibuluxobajilu.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/puvobixitun.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/35274622176.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c6316856690---rerusepetufodiviwajovo.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/japerigopoxamorizuzixilaz.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605d90cf22---33705572326.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4ceb52f4bfdf43c8707cd593a5f13caa/sugoxamito.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/65829789789.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031918238699.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c11b3e950---95526310323.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b0e4f33b---leforo.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/vefinenizadejudofakuj.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/22007052046.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/ninazotu.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/3i8blfo5qt475sve6jgbphv9s4/26275904033.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809aa1d202f---88115925532.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nbdk8n0lc04nco32tdt6mc2q5p/32244371411.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/21715210430.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/7743853912.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8d526537647c322cc109e7fc81ff1e4d/xololarux.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/dejomofinafogepimup.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce562fa42---gubikojiteniv.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/raratanudofigagana.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b777dcf87---37459262974.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1291ffc9---29793672372.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_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 17408 bytes
SHA-256: 294e615afca9ba6ad83c8dd854829f3b9571f07e21995e5280e08d7aa6998b00
font_01_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 10536 bytes
SHA-256: f575161effc9a0496c09549ba47b3a8aa9f7e3bef3a08d92d20db7d46b59a3cb
font_02_sfnt_off00014403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1