Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8bbdd329a39ee4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 11:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82f2b9b04b6c0388fae831f6c22237ea SHA-1: 7455d50827711db41cdee1d839908045c8962cc1 SHA-256: 7d8bbdd329a39ee40ac8df54266bd0d1da575836ceab56f5b8e1951524e4beef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dydlhx.com/upfiles/file///kalakososudus.pdf In PDF document text
    • http://sga.cc/uploadfile/file///2021092601542218.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/latifuxotixoxopo.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/zuluj.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/rebilugejisonalemaxajif.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/79510895163.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8be671937---7564051871.pdfIn PDF document text
    • http://lulanjina.net/upload/files/58919518599.pdfIn PDF document text
    • http://pay2pay.net/upload/file/23942749280.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/runobozapasesatixele.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1140ec649434b77bddafa570b85d399e/werilulije.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/bitibixo.pdfIn PDF document text
    • http://gardatrans.com/content/Files/32410830465.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///59500214535.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/buturixit.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139b6c879daf---jikukawupibukimewedigab.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021923936244173.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613147d01f44b.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13098133392.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8568cce79---68289944752.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/11692674437.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/96375654630.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/53627242064.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/57161936569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=call+id+faker+androidPDF link annotation
    • 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_off0000b336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB336 10204 bytes
SHA-256: 1523524ec6431756aaffd183a10efa0e62a82b79998298eb63acf558968acaee
font_01_sfnt_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 14728 bytes
SHA-256: f521810a44e4cf021f5f2c4a78c8494db52ef2423ead6409ae3ebe775cca53fc
font_02_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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