Malicious PDF — malware analysis report

Static analysis result for SHA-256 c025da5e2a2b7d15…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 22:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47f8efbec77ba060083e3236456599fe SHA-1: 57f342529b4327135c34a7e04ff98ca02a24ba5a SHA-256: c025da5e2a2b7d1592889f5d3700704ba94cf5b3f49e128cbf4e8d6108e7f91e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute phishing content or malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=outdoor+pantomime+near+me
    • http://on-video.com/movies/movie_data/file/58419911644.pdf
    • http://divorce-difficile.fr/userfiles/file/jimetotifaketemipu.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/joxumesizogu.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/jbolvbc8fi4evir9adn8ct92md/71464665093.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0fa54709b7c5d43856283985b4ea6ccf/volefujenito.pdf
    • http://ouhkpthaa.org/userfiles/34903382097.pdf
    • http://malbreil.com/userfiles/file/nibesuxovu.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/83fbbe47c55fc190086ab4d0cf7dc966/64698685780.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/kurinu.pdf
    • http://beerskiboot.com/img/upload/file/35781213333.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0f39b5a5588821cc785fa938050cf059/81979791256.pdf
    • http://vladjurnalist.ru/archive/file/588292108.pdf
    • https://avenue102.com/uploads/file/6565119910.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/72d02e617f9bc0027b522bf8df6a525a/23669650383.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b597920b04b---96591347414.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c952720e645---poveninusumelulakimaxexel.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/82656fae1da805e603713c5a07ff1801/47670156744.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608227168eb30---funawijaxevutowigitimuji.pdf
    • http://davidhammerstein.org/userfiles/file/zozafulijesopinaxilewarek.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g8bm8qu4n0477884q80al64ru6/1488660731.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae4ecfdcf---73115716912.pdf
    • https://promobryansk.ru/userfiles/files/18446881641.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160896085aa309---taxuvo.pdf
    • https://o-dance.com/upload/files/xedekowurovemusulexasuv.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_off0000f476.bin
a7ed477ce2cd17254aee17eb9027f6bba9d2ba04447a84f437f4dd087fc569b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 18012 bytes
font_01_sfnt_off00012404.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
font_02_sfnt_off00013c1b.bin
2638e29747db6e239989e22340c7d68d9bda312b1c9b4a3577ff750c3d84fd57
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1B 10464 bytes