Malicious PDF — malware analysis report

Static analysis result for SHA-256 946df789c9b17113…

MALICIOUS

PDF

88.6 KB Created: 2021-07-08 08:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cff9357298e23bc4754e366ae98ae124 SHA-1: 0d23e2b3ff858eb50cb6166cf952c3d6d7dc2bf0 SHA-256: 946df789c9b17113bdda737126203a5b8565f56ea85283af411286485ca3793e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised WordPress sites. The document body is unreadable, but the overall structure and heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cvsa4uji3f6fo9lnh3ienpps5/69155601728.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/24506366785.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098afcc95896---lafutuzaga.pdf
    • http://alexlunacoach.com/img/editor/file/gizif.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f137e68cc1---9031831731.pdf
    • http://anatolianlgs.com/userfiles/file/dajorisuxinevunurijapufag.pdf
    • http://growlink.biz/userfiles/file/82532182273.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c25265f6---pirekin.pdf
    • http://nusratali.com/userfiles/files/17157512196.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbad2bd73---voninewig.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20eb087ac---dapeguf.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/69844c29f429688fc80c1384b4a35f45/13499666301.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a41ab89caff0e38590727b39aba55f70/84185530281.pdf
    • http://campfirewtx.org/userfiles/file/64420055509.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/56791907703.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/86ac618c69ff605ede711b746fe88df7/nufutorutasabewifuda.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8771e5917fd40498e5d8e5d90db3fcc0/bibumu.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/57fc04f67b0f55bc79f1332554911484/birivefobukodujasi.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/tekebabuk.pdf
    • http://wamer.org/userfiles/file/60179725978.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0198e8bb9f---63552933855.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c585c70e5b---15992755009.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/439d8f3618b7d86009e343d4553cc05c/ributavijubamiv.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f447df265---86870225934.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07bbc86aa---dotexedatu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=curriculum+development+process+and+models+reflection
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 16792 bytes
font_01_sfnt_off00010cbc.bin
7a2ed5920c7a2d48484bbaae405d62ea2f5c7773918a4d58e579fe250e24805a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 17172 bytes
font_02_sfnt_off00013959.bin
21f5aae40c0ed550a639212cdd84239255ef6c49fc37dae44e014cc2e9e427c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 10976 bytes

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