Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ad9bf11da47646…

MALICIOUS

PDF

78.0 KB Created: 2021-06-11 08:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ef6351b62927d55cbf5e74b95f3a172 SHA-1: 7f0f59154b91667c6177035400a21c973609bbf3 SHA-256: 78ad9bf11da47646b63be1e8ffc557d0428d18a885afd448b9443ab8befb4d4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to exploit users by luring them with a fake trainer download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=bully+scholarship+edition+trainer+pc
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0f516ed3---zamesipumubafenogageput.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/242e4aulvtti90jeb7ru29j13l/48313215994.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fhmfatqoabjq5sj5qoj8a7qaht/92249955787.pdf
    • http://euro520.net/userfiles/file/16215399811437624359.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757109466eb---likutawozog.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa247cf22f---vozanitalififuzuxuxenil.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b90dc2469---govuzepusu.pdf
    • http://skncn.com/u/files/11319405773.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/cflf4g4t051rsh27rufptghot7/gulovavewodadetonamewun.pdf
    • http://curry-box-deluxe.de/userfiles/file/fijaga.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/e56e8ev52opk61v5ntjhm2kdda/nasunowap.pdf
    • http://fkhd.cz/data/img/xetesebelibebukif.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106081830425146.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98c0e551e6---parewadoka.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0cdca3df3563a3f9b4d21f00f477439b/59549100497.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f2.bin
453e1404d893f5be75c0e4a2d00588d8962e918235aefeceee0b4aa04433afbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 5312 bytes
font_01_sfnt_off00010505.bin
d869d2665d3dc007c1a61cc5cce8bb44ca8059a2380d1c50386b1f08b9754cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 10644 bytes

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