Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e79a9f97fac2a5…

MALICIOUS

PDF

60.2 KB Created: 2021-05-31 14:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad5532091c79fe9de0a2f4db628c6a0a SHA-1: 9959ec0d99156be9df7afcabd8500eb6b70e2832 SHA-256: b2e79a9f97fac2a51455855553e3c96b5ee2f4d3903d53e06f96ab47b1cda036
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious PDFs. The document body, though heavily obfuscated, contains text related to downloading a PDF, suggesting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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 https://laborke.ru/uplcv?utm_term=my+little+epiphanies+book+pdf+download
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/kd1duio41bqs7br1r7c3kifoie/87199413049.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/uhb0n3vguuj9lguobonhu29r65/wemabemakanipij.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609655de79de7---jexepexami.pdf
    • http://www.aportecnica.com/imagenes/editor/file/wataneniremoresovagafeso.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8d86277804e8e8182975ccd3f5cd8592/48487749261.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/24411243536.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5eb7b1037---nixatutoxilugefekezu.pdf
    • http://phantasos.org/userfiles/file/rajikofovefezavun.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsnojremcigckpsiv4liuelcp6/kobezobi.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a813901b74e---99629871335.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b00a1b8b---kepikesom.pdf
    • https://mn-lawfirm.com/box/userfiles/file/mevepat.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160727c07b61a5---35847388527.pdf
    • http://bularz-auto.pl/images/userfiles/file/wuvonubanelafugudow.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8cb09825de79faa4a2b46295c63647ed/72893155724.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_off0000dae3.bin
d7f48f29abdd78d365576180a017f846bdc28b7d6b8260a130e50081e0b7f4e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 5436 bytes

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