Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fcade10fdf62e6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 10:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edd70899eec39ef7f4d450240bfc64c2 SHA-1: c4c0d3893655b0b4e3d04723aafb9ec513a00989 SHA-256: 17fcade10fdf62e64ad58b08f88c2963b0f6e5e93689be4f139aedca3eae13de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as landing pages for phishing attempts or to distribute further malicious content.

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 https://catamma.ru/uplcv?utm_term=the+connor+project PDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160850a3cebcdf---93593433560.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9f7e6fa2---74074162211.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/nusapopedakuzijanefurox.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/fetekirobupuxa.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/falejetoxevijenabe.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/xorem.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/fomakozelur.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/tazowovo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609881ff5e5a2---xibuvodinanasuzas.pdfIn PDF document text
    • https://efnnma.org/files/file/11913908496.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f81d5f8a864dad579b1545f11f250b60/20672049405.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/6i89muicuk1thto3polal8i736/28356588.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/69a69dc9f5c811dd4845d9318d808de7/81142519281.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/92498187357.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/53418605736.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rgg02su0em9s1bh25a2irjjtof/xedamojijusiba.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/19884599862.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/34093673309.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/87987410928.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/90655942154.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202108131207565880.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/zitonetakekibesato.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/tegoje.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/9946658972.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/fojuwow.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_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 10096 bytes
SHA-256: 69ee4f64eaaff6b7a45bec448cdac7365f75d2fb497657c990bb8b470898569e
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 17668 bytes
SHA-256: e8c2864b422514f9b0d3be843d71f9b29c618c46eb04130318e8be389191788f
font_02_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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