Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6de298a6e04b7be…

MALICIOUS

PDF

76.2 KB Created: 2021-06-26 04:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c2f81bd7a6d11cb58cb7d6d7b57c159e SHA-1: 11a37580954c93dcf6df8f46d3a27a8c6252f906 SHA-256: f6de298a6e04b7be09d1b7a15a5342217bcef11fb732b535f5e7682add8f78d8
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=english+for+general+competitions+from+plinth+to+paramount+pdf PDF link annotation
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f08d4a07fb51cb0d26c565c46eeb4c2e/96369545992.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/221824ea91a66499527fcc633f4abbe0/720838355.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/78383930374.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/29450982142.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/94798073185.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c9610895---zimadalovupizulumuzug.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/aa9dae0a41f2b297f1e0ece0fbc0c832/40284074937.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/18197384530.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/5p4nq6thu8gbcbrd4dvubekoa4/rabibi.pdfIn PDF document text
    • http://jaatkinson.com/userimages/dorut.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/fuvumapipoga.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/vizefetubusuxi.pdfIn PDF document text
    • http://digifast.cz/userfiles/libanaxotomonifaxuzefu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/73c47a66baaefac46f585b06026f9c39/52809948243.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d9b31226508fb00f2abd238350319c2c/dudiferajuwu.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdaec2cb7---taxogejuwitalot.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16221743175134.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a54539891f5bd69e35ca179584e5dcaa/86856559851.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcae6537a1---77035091150.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28fc931c77---7776548483.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a24b31e75---jozanigebixajugepulam.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/26225844202.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/66207853f7bf22087598d3ffc5d2987f/34472097730.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/zomibakozanivuzusenutuje.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6161dc3225---sezagalaximonuvo.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_off0000c30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30C 11152 bytes
SHA-256: a83103a766ed69b49b624e4acf8c002c8c2f9eabea1e3329a8fa53fbb2b8a6e0
font_01_sfnt_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16948 bytes
SHA-256: 47bf86574f9ec870a075e954a1ad0dcaccad814fa2f4db649140ee071730dde2