Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d1eb8aac381108…

MALICIOUS

PDF

91.8 KB Created: 2021-06-29 02:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c9a1fb046a33a46f7a2d2dfeae1a5775 SHA-1: 0c964da1ca8c19a1e5cc53c7d352e44bfd509196 SHA-256: 35d1eb8aac381108fdbc8097530f1108de79e3c1dc49a1b7b858ea7c54d8cccf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external links and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=congrats+on+your+new+car PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160902fab445c8---78978734131.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/lexatav.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/duwaxasuxiriwopisemimur.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c27364f12---bukosurelulaparutixo.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9ed5b2a4de853aec4810f9c7af0c03eb/tutorisunub.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/71557339693.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5789e023626a709245ecd08af1067081/bogumosezalezide.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/1fdopl25abc2s2q048fm9lf5f5/golonala.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579d65dd92---begalowised.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/nesirunurelemugejavikebus.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d6a5bb648---fojisutemixilurupu.pdfIn PDF document text
    • http://brukbet.com/user_images/file/54525072503.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc7159df8---56128825374.pdfIn PDF document text
    • https://pellevah.com/upload/files/bixiwonorilaxasezorawun.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dq7i7mjfub4l841i01ma9ji8ms/tugagako.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/risupufagalasiletubizu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7772eb7bb55fd165b8aef2cdcbf94b94/53279016005.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96de6250c---muparuvenelejeto.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095cda0a02ae---wiwivozimorejoxol.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609341db4c9f7---43196316925.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/94448849804.pdfIn PDF document text
    • http://kleiberit.ru/files/file/89746142646.pdfIn PDF document text
    • https://service-panev.com/userfiles/48248679760.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/4970344577.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_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 10596 bytes
SHA-256: 0f4e1a5607219d136e37257c775cb0dd69cfeb262b1ad8a7628145587e5ba788
font_01_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 17184 bytes
SHA-256: 922931f09668f93fb3e32fd73750aa57e364dba41d837b535591207b4f3792dc
font_02_sfnt_off00014a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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