Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae6f20394992dae…

MALICIOUS

PDF

84.3 KB Created: 2021-07-23 08:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3de1dd4f2674bebe9666f368d1e67a09 SHA-1: ed7692d6ee21f76befa1ef6853500b7a44a65d8e SHA-256: 4ae6f20394992daea94b6488b0ab797e978b9442f39b2dfb9551c8fcb170db3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' and 'super-forms' plugin directories, suggesting these are used to host malicious content. The presence of a link farm on disposable hosting further indicates a phishing or distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7d88ec33---mamefirepilizosatasam.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/mmhb1n3noo8omdb431dsbb5io2/wibamovajobexuw.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b720989802e---70014075216.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/78680011740.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4751ae85b5a6ba8d3e819a84ca3a52d6/dobalivudigadobubejenimul.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f9a43d8f1cf8d4cf542fc715837d5f86/70436404521.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4c80aeca---81715694254.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/pifutemujanikuxumivuxe.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089323595be4---kiwugezumowoga.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7675fcd8a7---41493724664.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/65649647690.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b54834c6e---29048779317.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b257126f4f7---35297412566.pdfIn PDF document text
    • https://cargotavio.ru/files/file/87117968734.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f2ea1e5da98ed7e96e36fbdbe4f9168f/94957977509.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/89074198303.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fapevilodelibajopanat.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wegetaxuzisedefoxixik.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00e54a3922---bojikeroneg.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c6688019d5204768b121b4b140052975/37149926179.pdfIn PDF document text
    • https://people11people.gr/uploads/File/56671577167.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xazetebevewapuwisifafov.pdfIn PDF document text
    • http://abnicum.com/files/file/74064988289.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf94e8f08---zumugevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=new+york+temporary+driver%27s+licensePDF link annotation
    • 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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 11044 bytes
SHA-256: f94b62217a79d8d6f9597da2e238b98a6c5f90b8a426c64ba394f86fa69417c2
font_01_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 16380 bytes
SHA-256: f8069941aa8672571517464e4f133640073a8740b071d0d76da894f7718588e8
font_02_sfnt_off00012b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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