Malicious PDF — malware analysis report

Static analysis result for SHA-256 b612d437ba5fe0f5…

MALICIOUS

PDF

69.0 KB Created: 2021-09-04 09:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3497aaa92908d2263cd644dc760307b4 SHA-1: a06cef648fb82ccfe67ffb408fa541f74bc40bc3 SHA-256: b612d437ba5fe0f505b8ab71d3a34854ab2fa58796c629925ad1caefc5d865bd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its structure, containing minimal text and a single image, typical of a screenshot designed to hide a clickable action. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/58vegv5q815qfli249mp6d8ks2/2552174889.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/38uh09l9v46e140d8jas8qidp6/woritig.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f0c235e21---50111197131.pdf
    • https://granitabrasive.com/editor_up/dorutazarelonu.pdf
    • http://vistobrasil.net/uploads/file/84071216428.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/64023208605.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbce40ab97---satepepuporununuxi.pdf
    • http://avonsteel.com/UserFiles/file/gotokukibuwelexirazazim.pdf
    • http://zubrcup.by/files/files/46488361780.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff30db00259---34278147613.pdf
    • https://grancom.by/upload/docs/10164214069.pdf
    • http://geyikkimya.com/userfiles/upload/file/webufakakujopimipoj.pdf
    • http://vantaibactrungnam.vn/upload/files/35808530275.pdf
    • http://clubselectionvoyages.com/images/file/wuwejutekan.pdf
    • http://photou.cc//ckfinder/userfiles/files/badikunogijoxazejab.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcee47e70bf56d8439b6b23d50d12992/xoxinuwetidibixibofix.pdf
    • http://ansonseatery.com/uploads/files/xuzewirapim.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/fekazigexixumikipitifaze.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ac96c219d1fbc9b88dddf197d3025fcb/kuvilimun.pdf
    • https://yalcinplayer.com/calisma2/files/uploads/zivinojilu.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/72jc02beg243fv6jgii30kdq41/99947664278.pdf
    • http://occahomesearch.com/userfiles/files/16932034144.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/70992a5feafd103456a64280538bc2d5/91284383142.pdf
    • http://55thocscompany.com/clients/62662/File/96540528264.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/21efspvcq3g9t2embftevco340/66225934323.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ap+old+age+pension+online+application+pdf
    • 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_off0000b1c0.bin
50c0e830902b70b97f6fc2c868da482f0754c9f1f83392c39bb28061e33cea85
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C0 14400 bytes
font_01_sfnt_off0000d5c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 16792 bytes
font_02_sfnt_off0000edd8.bin
edad3419e1da9d1aecc0055e3a4fdc1f0358aae72154a0e7c4d7ac9d0765f529
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 10676 bytes