Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cab16c79900e35d…

MALICIOUS

PDF

90.5 KB Created: 2021-06-27 22:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35e514239fdff785ea6057a7ee6b77db SHA-1: 707c3321ee97a47080e45f5fb429a20188aec8cd SHA-256: 2cab16c79900e35dc94414051dda97d241c34ff49c1eb3b70811b45a34317836
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bb6de744723254e3e509ed1094d08416/mifemulixizow.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/127b1fb85044908d3ea7730c6b99cf3a/votoxurox.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dacb31b81---63053688514.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9483d6e48b---puregub.pdf
    • http://jucal.es/images/file/46241592515.pdf
    • http://rld-carbon.ru/file/80168465989.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607a06482181b---detefujis.pdf
    • http://saovietgroup.com/upload/FCK/file/27077612983.pdf
    • http://karthikeyanjayaram.com/userfiles/file/niniruxes.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/s7ved0ns2hhr557mceheeig7vi/56132396271.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fb2194c566aa7ba89505e18d04b4ebbc/fevazokimezubisizogok.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/70348760168.pdf
    • https://aduanaldelvalle.com/userfiles/file/3255519178.pdf
    • http://klpa.net/userData/board/file/58170098331.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2flk0k0dm3erkabs6ib4qrh4i4/9861641213.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7fh7csqo1vn59vtcc6vp6g0d2j/vixuj.pdf
    • http://orderkai.com/uploads/files/ronaxejoliliz.pdf
    • https://osikovo.eu/webroot/img/content/files/42321029897.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/26165603710.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4381b4a1b---podiruxeju.pdf
    • http://rogo-rotterdam.nl/files/tugoviwekekamebapolowi.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/54471cc01a1d409af343711da5d94a8e/fupopurezizodosorivak.pdf
    • http://aliglobshop.com/userfiles/file/38154095725.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qlijaop6igv6k98sfbc7307rt3/12445163139.pdf
    • https://kede.org/userfiles/file/23215863978.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=medicare+benefits+policy+manual+chapter+7
    • 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_off0000fc4a.bin
aa61c7780fc166bb0a0e0fb2e56cba2a1ad7b256c6fef3b27d07e744b74287a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 17456 bytes
font_01_sfnt_off00012a20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A20 16792 bytes
font_02_sfnt_off00014237.bin
59f995c8246c29936b6853e491c5ef7eace70a21f8681c6001e9ee9d1df8734b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14237 11284 bytes