Malicious PDF — malware analysis report

Static analysis result for SHA-256 46491efeaed8d12d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 10:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99cfdf319b2986b765ff03ff4ef3de47 SHA-1: 4e4454046a7932ee43ea1b81782569c2662c9a5a SHA-256: 46491efeaed8d12d917fc7400fcfd0cb84d85f96a065818711c303baf7c96763
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous external URIs and functions as a link farm, directing users to various disposable hosting domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=ex+libris+game+manual PDF link annotation
    • http://alpha-cp.com/userfiles/file/zakirobofefekiziseleveb.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/patine.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/fajetanur.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/renuzatiligabefuxobux.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/daxekexubudajanepoza.pdfIn PDF document text
    • http://vodnik48.ru/content/file/76849293670.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d2339c60---gisow.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/eecaf319b1a48003ff6732523ffd26f9/73228802030.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/jizubadopunus.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ko46hm1t87b36gvgngcfh111ug/pawovujineluvetirabiwifem.pdfIn PDF document text
    • http://africareview.in/userfiles/file/55374902920.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/49105430842.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/1tubaua725j4j5c6js1dpf673f/pirurabefafegeruvijiv.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/70950780079.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/p2vk0q0j79rn2pqbflpu2o6ga6/kabenakuvorawusapewiv.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/rixiwatuzenad.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/vugosiwovolarijotixigej.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/dd307cd2046698abf5b5f8c1acf21cce/walidapimavalagovuga.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/vufakezurupun.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/36770754987.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/mudasizepuwejipanajajiv.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vn98fv9duapahtb6ohk3geo2s9/99231186603.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa1cc29600dd017c6e07864c1c6de4a5/fimiweloderesuj.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/34efd05842a7140c7de2513b020e60ae/sekoz.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/70515227140.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072003363077730.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 10556 bytes
SHA-256: ac8436b153f1127bb0f1c790ef7816d8262b14efe68506b7f8417c8d71f6d466
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 17320 bytes
SHA-256: ba8a6d31a8f1b9e109c0b192535831e7b843825017240c60b4ba799116520715
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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