Malicious PDF — malware analysis report

Static analysis result for SHA-256 461df431a4425e13…

MALICIOUS

PDF

123.5 KB Created: 2021-08-12 11:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28814ee2cf529e8cc212970ebca6a02c SHA-1: 454796713195b7b44e3eb6320e55e5b607765f0e SHA-256: 461df431a4425e1364d46bfae450c26ba04a2af5a9a962d2500048cfab2b031b
154 Risk Score

Malware Insights

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

The sample was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially untrusted hosting. These links likely serve as a lure to direct users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7564

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 http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607076627119d---84924126580.pdf In PDF document text
    • http://teplorium.su/userfiles/file/51262836108.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608663c0debff---difegoworavik.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7fc55b056---61493887342.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160715f92bbfd8---18626492883.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/1160f6d7bdf1237ea76e21aa07a10282/25596228886.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608666435be5e---76485251602.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a115db8de1a54d2af28fb90c7ab20f0b/36513594242.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ef0562bf350ddb942b345833499becaa/35247684178.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/kiribimofogovakewarelib.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a9479ceaa88ebca9dacf625f8828a0be/96768637931.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/15151112312.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/a982f74d227a562cebcffdf92d961d25/boxutaxexo.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/zipojojuvita.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f186bfe0f---xuxafufawuxititotofu.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/71099889400.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a199da5518f---nonasese.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/19405278086.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-11/20210511191058802364.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rdgossvucp31025vs6u58r4re3/nuzewekonawewowokad.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b1b8042e---26452631984.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/66095452870.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/rokomagemevovil.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ee6efc85---21843971483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nsa+softball+obstruction+rulePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1