Malicious PDF — malware analysis report

Static analysis result for SHA-256 464fc4c2984f3541…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 10:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ac0746186334385e48bd3166cbee979 SHA-1: 93a96e5562e1ae674b49910b3b1cf72c4c514a4e SHA-256: 464fc4c2984f3541b22d7f999b96128c8880518cd0f495fea5103afae94e1955
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malicious payloads or engage in phishing activities. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=pn+junction+pdf+nptel PDF link annotation
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86635a5cc2---luzodojebawukiginozegim.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/72385093513.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/oggful7knipd35bf9lrtab21ab/jizoruku.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/3239457889.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072842b311f8---77020296815.pdfIn PDF document text
    • http://baoveantam.info/upload/files/65063182946.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/26305424013.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/57363384045.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8d125ca70bb376e8194ba80b9ba0e12b/72023049154.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/jepudodirol.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad63a54a5e5---ribowowazinugekusebanukup.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/33731772264.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/19841472944.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8f5662rg87jdjdat6dvdeb4fpd/wixozobixedizisimojap.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/begenenamavogid.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6fc4306bb9ee67f561f72faae9f0a1f8/buzuribaregeba.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210806/2108062003476674814acmo6kzuku6.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/80471714150.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/befivupinagowagir.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/68412173050.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/poban.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/petutajipemed.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 16828 bytes
SHA-256: 7a8515f8a5be16a58e67aaa4477b52247dbf0d1dd1005c375fcddc2d368fd9b7
font_01_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 10412 bytes
SHA-256: 056b43c2ad712a53b0f68dda83b495bdadb950a52c0fbbf3fb1a6675bce60a06
font_02_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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