Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce40838469ceb92a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 03:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25630775b453f6640fe6961db569c728 SHA-1: c79a0beba3f999875fde86883cf7a657e482c7c1 SHA-256: ce40838469ceb92a65c61bf7bc9c805ede53b2d7707f3ab0e93df8621df4e4ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=free+download+preschool+math+worksheets PDF link annotation
    • http://parvazyab.net/basefile/api203/files/95739101753.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/bakudakez.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/21743277303.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/87645983003.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/57217944420.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/zumenosaxugexunerare.pdfIn PDF document text
    • http://clumba-indoor.ru/files/files/dovebarukaz.pdfIn PDF document text
    • http://jcpingie.be/public/files/48011847856.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/dujufugo.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/54385661660.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161294689bd304---63714117154.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ffc0c7a969c6e047dde25461a0f302c1/tafepakenalirasudali.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/21697110590.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/xogedogoguburaj.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/60508042264.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/21113836458.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/77733901451.pdfIn PDF document text
    • http://epmachine.ru/d/files/90562892666.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/65014702995.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/zelutibibaragoruwelex.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/10061995160.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6bf7cce54d90fb4d5a22df9589db3e8a/jefux.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/28dfebada3cac48c57aead636cfa4dcc/govatipefewuxefufi.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/zumotavuxoti.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607886f077702---bozufaragitiduzijobepo.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/6396985026.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_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 17756 bytes
SHA-256: fac98d4924cc8a312a6c5c97eba0169e7acf115be35ad0f59d2d31eee0d85969
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 10844 bytes
SHA-256: de8d14776b93b004a4f412ceadfab068be127e8fa7a3a7c5d2d66ad369337fcf
font_02_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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