Malicious PDF — malware analysis report

Static analysis result for SHA-256 4485af5d16f10229…

MALICIOUS

PDF

77.2 KB Created: 2021-06-22 22:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 859bbc16fce8399ae0f1e2139b7ac0f4 SHA-1: 768b9a0c1a1f202f747d635036bf90dd926a10e0 SHA-256: 4485af5d16f102291be6ed93173739c5ef76668a112b52b39ce34564b7c39e01
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites, suggesting a tactic to distribute further malicious content or host phishing pages. The document body, though heavily obfuscated, appears to be a lure related to a business proposal, aiming to trick users into downloading the embedded malicious PDF. No scripts were extracted, but the overall structure and URL distribution point towards a phishing campaign.

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://coretry.ru/uplcv?utm_term=proposal+pendirian+apotek+pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160753e4c5f0a3---99523485896.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072499552d41---xigorepekedo.pdf
    • http://araonline.hu/uploads/file/xikaz.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/62731596193.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e215103bd---82677969399.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836370897b8---60936355886.pdf
    • https://adikkedua.com/contents//files/27341901782.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d307b88b98---96651468494.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5f2016f4c---76300215607.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076219481a87---10002951243.pdf
    • http://detaycopymatbaa.com/userfiles/file/manemodukaribasepaloju.pdf
    • http://sushi-belovo.ru/files/74152565359.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/22f1cb121805d16865be91447456ffd1/kemelakirabij.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/v8gjfluvna025c977hbatkp71t/2818510556.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077f28bc0906---25467246209.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/3subqab14tnpkagp243srvkkvf/13891100985.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_off0000f3b2.bin
7936822a603ea6080245bbf430a222adc28070b759ce8d93d1503de1bbeffbbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 5100 bytes
font_01_sfnt_off00010519.bin
632572547ff3c4934aa7a98e32fce2f4608d9ac4a216961d72421f5e201215de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 10204 bytes

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