Malicious PDF — malware analysis report

Static analysis result for SHA-256 9425b69bbc1a8f9b…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 17:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9e1f07420ee4c50b1cb042833d522f5 SHA-1: c148193cc903751c1a65a0a47ef6cf9a6433d91a SHA-256: 9425b69bbc1a8f9bd378c90a03f43d82c35c0934c18028ffa24a1d9181356466
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or downloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d043a057---bazumevimurilefazi.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/107g4qma3mqt092niikg99kehm/vasifewuw.pdf
    • https://gw21.ch/uploads/userfiles/file/vowasodujax.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/vhqs3b2vdc0bf3tiu3dnud9lk2/36179960574.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee25d5f29f---linigetedigemijezemaviwov.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d6004867e1d55c43b0d3695de92e4b5e/75828861539.pdf
    • http://canxetaianhduc.com/images/file/82027846745.pdf
    • http://giustizianuova.it/userfiles/file/bevanugotuxidiluz.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/25fuso1o9fiandgo3ed9gceiev/dexuleki.pdf
    • http://slsnn.ru/content/file/fetofafiruxibun.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ojt2oiibmiups9m7tdc38aduk6/mepewotorukotepuvivekofab.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c9bafb8247121a00ba69e5d8d66d8d4e/5120178076.pdf
    • https://xo-sound.ru/userfiles/file/62318743449.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c95e99e7d3---dumapalopokusozelejaxi.pdf
    • http://monkey-do.net/userfiles/file/51850687390.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/160461736b619520f89ae168fc075250/14466159014.pdf
    • http://iseveranscopy.com/upload/editor/file/10419117846.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/62e4c83a31895d8675e792b8f9191801/jibezi.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a49dcfcb5e8bc11155c467a9a3a6f973/80882967259.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888e0c4b4f3---23408702934.pdf
    • http://goldartline.ua/userfiles/file/kixoxujususegoponedevebu.pdf
    • http://northcity.rs/slike/files/65759350109.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=batanes+of+the+west
    • 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_off0000eebd.bin
bf3d4e552e774884e90a7ac0dbe2c43636957e72940211156c238cb26a569207
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 17380 bytes
font_01_sfnt_off00011c7e.bin
91588d458c6403c3f4f3a917b92d9c4571ca1f1165c1cb1290cf83c4d94add3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 10212 bytes
font_02_sfnt_off0001337c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1337C 16792 bytes