Malicious PDF — malware analysis report

Static analysis result for SHA-256 8488477cf689c731…

MALICIOUS

PDF

80.0 KB Created: 2021-05-30 00:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 272e139f06f382b63136e463f4e3f7e1 SHA-1: 1164e7466cf923ebd58647b44193f767ddebadc8 SHA-256: 8488477cf689c731a184c60849a921eea05e372b5b876b25d43cac059ccb17d8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a document.

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 http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3048a82a8---37750963001.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909d0ce9091---21387087431.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/32a80cb95cf2430e4523d8ceb6d76a6e/xeneramotomobagewijoba.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608189f49ab9e---57547718367.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bbundjj6vlbd6k1fokfbm21ds3/sepijakowuvezasimu.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a13d82f7---famudikuzitefadi.pdf
    • https://kede.org/userfiles/file/46512031424.pdf
    • http://nesthomes.in/userfiles/file/firelumekaxupizesiriru.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af9aeb4b5---vuporurumedeluxa.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4af77e2f8---visitapisepa.pdf
    • http://hesexpo.com/img/editor/image/file/90031249506.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ikke6nfn4bfsie891e9a15hl07/darotitev.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089783ca5b2b---futexadipuwemizijibuwu.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/5e7a57431b47e2aaa707d0e23e7f23a8/82763574583.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c85058c8a---86842882107.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/40617e2a133b1896fea3c490db09c163/juxofatopelo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=why+did+hercules+kill+the+hydra
    • http://irodori.kir.jp/files/file/47423957260.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_off0000f9ac.bin
ee8b47c2d0e2f1125bd23571628ccc6a4b85b808abc72a4a52ebad37b6e191de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 5204 bytes
font_01_sfnt_off00010b6c.bin
625c8db6048b5638ad0d4892769dad23683dae25bfa6df8e6c4bb53921f9b08e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 11804 bytes

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