Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c717e5d60218ad…

MALICIOUS

PDF

72.1 KB Created: 2021-06-21 01:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d99d6655d00c8f0f1d9ead9fe2df4a93 SHA-1: 500378b40243e2ab49e55f13c0f8acb0cb003597 SHA-256: 00c717e5d60218ad3fdf876064389ccfba2f52cccc9eb5935463c613cb5a66ed
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, appears to be a lure related to game content, likely to trick users into clicking the embedded links.

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://medvor.ru/uplcv?utm_term=horizon+zero+dawn+frozen+wilds+fireclaw+location
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/t2q3enmu77d9vpjmkb2mi02ep4/93314753969.pdf
    • https://ckd-otto.com/contents//files/gaduxinatoloko.pdf
    • http://happy-travel089.com/CKEdit/upload/files/28941394854.pdf
    • http://usmleworkout.com/files/file/fugavuporepudodaxekujuvab.pdf
    • http://panziofabian.hu/fck_kepek/81503833760.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1460bb893---zobaxogipupasuvazo.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a136f3acd63---3575023028.pdf
    • http://aryajob.com/user_upload/file/rojugefijusosoz.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fb830dc6121280b0b5b367a5436c6cc7/ladakifuxuxevunixusiruxox.pdf
    • https://twr1115.net/files/fckeditor/file/94171031783.pdf
    • http://kowel.com/ckfinder/userfiles/files/1623131388.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a268cb2e76c---fuvisopemabigavafil.pdf
    • https://acrgroup.nl/userfiles/file/78829160433.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/pajonabepejefiwowizelo.pdf
    • http://chixue.com/uploadfile/file/20210521221909.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7c481051---41612571659.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/eu17o3nohrlgtfg9v7ef4evmv3/73825331429.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dcc7.bin
a1bb7f67370f3f646cf3271672b1c0fca8059c2c5c32b5531b854f208678c3af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 5116 bytes
font_01_sfnt_off0000ee5a.bin
64d2ceaaaa1c4a09e0650822040189cd7199abb7ddbcf7408313a73e80c7fa4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 10352 bytes

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