Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d164b4a8e13c58e…

MALICIOUS

PDF

68.1 KB Created: 2021-06-03 14:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6f7dac50beb6ccaae751058330cc222 SHA-1: 68487e033f417255351262e8245fd3d22a9136b6 SHA-256: 0d164b4a8e13c58e0109ad783390eda0ba64ba9b57a3ca93835da6995b4a779d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the structure of the document strongly suggest it is part of a phishing campaign or a downloader for other malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8ae0eb7f03ae00a146b148c8c6cde0b7/dikoxogatekotomu.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/175bcb5ca157e5c398570b0c830464a1/75060771301.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e38225c609d4ff90aca6a036b649acf5/59812851083.pdf
    • http://saovietgroup.com/upload/FCK/file/52700415436.pdf
    • http://sillajen.com/fckeditor/_upload/file/mizuxaw.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/eah16if11kulplripdq8go9rqb/29423196587.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c90534b49---27485251832.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c69b8973e---wutetenomalak.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/takatapotutomuxevij.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f7274277c4e0ca35f8708f3fd659e159/vozipexezid.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9sm5bn46badg3cn714utbp59an/batotimixol.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9daf6b4f48f76c5a3eeda7ed6d6bed71/43071235866.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/21847864967.pdf
    • https://circolodelpistone.ch/userfiles/file/xosemupijedipod.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63b10e7c4---84013681975.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c6e91efb3580557850fa939ed5cb1235/43627934418.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=imaginarium+classic+train+table+instructions+pdf
    • 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_off0000cc0f.bin
4076ef05b82acaf3d08cd786b0ed8de4db74757a60d6f775a5726457664900b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 5552 bytes
font_01_sfnt_off0000ded6.bin
1611288ea103cb4505d2995cc6f91c5ccb22f3f89b27a99c6db7f79fb97fd462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 10812 bytes

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