Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2bc097a5023025…

MALICIOUS

PDF

69.8 KB Created: 2021-06-12 11:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c7f5ae22e20558af5860afbf55c48ab SHA-1: 7e3f5ab66450a622abba2e3391231390ba241d8f SHA-256: 2a2bc097a50230251fafa83df57f801416a8bd9a7a2c0373ea32ac7200d24f56
154 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to academic exercises, likely intended to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7986

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=past+perfect+and+perfect+continuous+tense+exercises
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/494a01cfa74542e70f96d821c0b450f5/fetaxogogolifegedibapap.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6e5d8d1d---rixinexibujudelox.pdf
    • http://www.bash.cl/media/file/nuwodisagesokotanisovosov.pdf
    • https://aspirans.com/files/file/95424708000.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160affa1fa115e---xavazot.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/14218445d096f7466e9d58ccc0cd8a33/zudogisepaxewevaweruv.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5m98ue2kcho2ut13f5aveibjpr/kuwidovukalomazi.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/4099697756.pdf
    • https://advance-pack.com/editor_upload/file/zobevizosijoliduguniweso.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f600c3aa0e---jodotok.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d07a3174---nujafuvotevasidizoniso.pdf
    • http://alliance-ltd.com/userfiles/leloreputesuraratibobegat.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba0ae5005---82953378368.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3b3f11480---72420571755.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3e.bin
5393d9949e7916f6fdfc4d4fd055039468af5d70a77cc5e68c55acc6d570f688		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5188 bytes

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