Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58ea11bbb576871…

MALICIOUS

PDF

84.5 KB Created: 2021-08-17 02:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e58442509a89be582311f2aca55abcc SHA-1: b14e220307f59b5d88b0a58673770696ea95da73 SHA-256: d58ea11bbb5768719154a64d0570b85c797a9e1f66f3d492327d80feb7345a2f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085383e0d189---gipupisazifotuxizuxagek.pdf
    • http://aarogyamedico.com/userfiles/file/26589726688.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ab74d3b34d460410283e47eb14f91600/rowotuvinurazopoxo.pdf
    • http://mp-journal.com/media/file/10825398361.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a358dcb93c9---64634546396.pdf
    • http://wabasnb.com/files/fckeditor/file/42216917460d8915830d00.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5083ebab86---romiferatiwarok.pdf
    • http://antasboru.com/guvennet/resimlerfiles/nakejupebisikapatedel.pdf
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/28001617828.pdf
    • http://allg-gyn.ch/userfiles/file/towifol.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/21e5ac66e1a46f0e18fb16c052bdaee1/58242825964.pdf
    • https://kuraniterbiye.com/resimler/files/95319781270.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c584d77b02---netir.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/14aebc2b836d0103e0ebac2bd7dbc991/48666384480.pdf
    • https://bacninhonline.com/webroot/img/files/89801638524.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8aec1afa394e56cfe0e4da9e1907a4e1/rudopize.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/06fbd4018630a9176d4b701d44b003c1/98966749710.pdf
    • http://agrobud.net/uploaded/file/26675719523.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb98e71b7---75629620455.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f84c52f8b---34778823208.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087e488ded62---42273575507.pdf
    • http://thankschicken.com/uploads/files/46742586968.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607360a6f20e4---43881774098.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0c7779143cf749cfb9586c3eca2f8994/jomojobisurepagukenujubi.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af675ec5581---fobaji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=las+4+p+del+marketing+mix+definicion
    • 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_off0000e3c9.bin
74774667989609558b0b40c40b1775a4579c1a6910e6306f43b1d32b0d7c175a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 11192 bytes
font_01_sfnt_off0000fdd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 16792 bytes
font_02_sfnt_off000115e5.bin
2fcc388dc75e5a0ea3f008a43f06200e0ef81a26819ccedbf4779bd49cddd476
pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 17380 bytes