Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2def95ad627182e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-22 22:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 919a56b7c2a37ba6efaa1665ecfe120c SHA-1: 7e482924766e77768f4c980442c9075d0fcea1cb SHA-256: c2def95ad627182ea0c76d47e9ff47acce9532e7d0406f69fb146eb42ad47106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=iphone+6+bangladesh PDF link annotation
    • http://eau-msu.ru/ckfinder/userfiles/files/setomegij.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/27793735112.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/saloruramuwap.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/2040780983.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/sirepirovurulagelewilo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16130af575fbef---galuwakigezodasipe.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/podakinokomizav.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/pepumoniwowotefanosuwode.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/40185420830.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/60885917173.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02adaf409---buwodezodipu.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/22605791350.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421b0c19b91---21533199461.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/melozasaredozami.pdfIn PDF document text
    • http://m2m2design.com/userfiles/35264245037.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/dapunatapof.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/248dd5e93f6a5c205725f7f8e667b68c/wumopap.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/78227107403.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/29829481800.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/bovalutepiboridexuput.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ccf65c285448c4f2f26d2d6fcb96faef/75668803270.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/53821959111.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/nonufozomowo.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_off0000c216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 17760 bytes
SHA-256: 22e2e816e25773e687f68530d546b3a4b0b1ea055cf29e6752c8c81b92c5b983
font_02_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 10640 bytes
SHA-256: b7324c341b3124c44fbed002d2ef81d038e5f87d3800a9828f58a418d54e32b2