Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ceb73494c2df066…

MALICIOUS

PDF

70.9 KB Created: 2021-05-10 02:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3653e47f9fe4b49744f76886aa00ea38 SHA-1: 55d7d81e3925a6edac2ab36f41c86188f0694349 SHA-256: 5ceb73494c2df066e7609850d8af9784b94c0bb5ea50dd678dec67de7259851c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'Steelseries arctis pro wireless software', aiming to trick users into clicking malicious 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://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070126c410ae---36433410415.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085663db48d2---bulupebifokigarifixideb.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7d2104bf8926b56dfa05864317ef96c2/fojugejamifumawesur.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cg6t8i23r0bg4s83lltbgje5c5/lotevabezu.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1878391a422e172991b21c829461046a/wepir.pdf
    • http://dentherapia.hu/files/file/35683791867.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7gfqpeb8ktiu41ps036a5rgn1k/16959974232.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d3491d09---38940110022.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092667db915c---73724277680.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/41990978359.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/303be7311f5b86e18070c6ed110ba8c0/29976536520.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/5m0asutl7rchqnr5p3k8oqb7v5/93628509175.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0169d91f4b65334b9cabe25027d55343/fekoximagomimawu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=steelseries+arctis+pro+wireless+software
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccad.bin
fe07ac88ef3287426cc0342e30b5cc38f3b1672dcb92f84f6a3e22a8c28bf5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 4884 bytes
font_01_sfnt_off0000dd5f.bin
eebefab1e232bc531cfcd4c616a4827225ae5c0021a35a6c47840ff68e4f3e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 10360 bytes
font_02_sfnt_off000100e8.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 4324 bytes

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