Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7faec2d5db4f759…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 01:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 835931ba0ab5b198e35a5870528aa6c9 SHA-1: 07903716525a8ed5851d8f1c21efd290e4cb4077 SHA-256: a7faec2d5db4f7590f51d2655ed52c38da61d73080de8ddffd4e0d64237c1e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution tactics. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=mug+life+android PDF link annotation
    • http://vpsystem.com/files/fck/75208008068.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d28fdaea066500b7b4040038deb94c07/xupep.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/41558401640.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/54881756819.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/zikotuderej.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cf3d58365d8b420a74d908ccf1c73d69/kibevanusunosikupufat.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kifisejiguvopalopiboleko.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/35295788081.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca84a4d6a6---wilev.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/86609068961.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/35341798822.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/71996888359.pdfIn PDF document text
    • http://ge-mak.com/files/35302681664.pdfIn PDF document text
    • http://benly-carson.com/product/files/21541338598.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/28812540991.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/dunulitisixudexibudedoren.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/82362334505.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/bilinijokevoxixonu.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/8288307569.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614491793e5b0---vawegib.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gorijavumevutebu.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/53934240595.pdfIn PDF document text
    • https://negaratoto.com/contents/files/65391340104.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16155b9acd51ec---luwunebu.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_off0000b722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB722 10356 bytes
SHA-256: d738248d9e56e6d12c65dda78849d244cba51fdfa31b3bf29b968cd8504634cf
font_01_sfnt_off0000ce5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 18328 bytes
SHA-256: e58a28f25b1ce894c301a21ce873d6b354b98b44dd7bd298643524f5df51e6ee

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