Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c1abb5723dd2b6…

MALICIOUS

PDF

91.3 KB Created: 2021-07-24 03:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: bcd1b931cc6c0b1cb3ec46bacf099f7a SHA-1: b431b9e5b551cd9f50db0707277d448d687c4f86 SHA-256: 91c1abb5723dd2b697cbf6fff13ed8de3607d29fa6652baa1ee126d5a49097db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://autohondl.cz/userfiles/file/51158984988.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l13e1mmmqlac0idt8am9mj1vlj/sipexirenazekep.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/48771563976.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dbkc0m66lfr4akafs306tots4q/tunojiwuxipojonotajum.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/25772871361.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/perefazemipojus.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/4kcr2ob3gvs3bmvlic0ij87vt9/vekizanonipuxejoluxol.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/zulemi.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a4840874e33b5ab276e36f86eb373ccd/toruwosojofikesa.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a4936926ca19bc223361ff17afd2dab8/vupibimudumejararozoguj.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b8b917720---92968460585.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3ifgqeb08f92k60h4d1n9b6rfv/14163183146.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/42790973103.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/pofugid.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3c6c59575---83081200755.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4c398cd6---fuwerowibika.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba34b5d2b---gagud.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918381eb42---xatafalemaloweve.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b051aab4f38---22146818289.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747d6690e21---19136469557.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/64t14mvd0dga5moa3t5ppbo7dc/guvolaturagubakabunobebu.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/didalijapazeziv.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4451d50bcf715548d971cbfa7929a29d/rozipogezuwekoxosijakorej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+eat+fruit+on+atkins+40PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a141f0e2498---kivuxutujukumafewamegige.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_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 17044 bytes
SHA-256: 04040bf39de2d3ff7a37ad30ed39416ca1fdc40acb7ba42c8c7eb47b8fe03801
font_01_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 10696 bytes
SHA-256: 751e0e820ca61016a6fed57390986b5b4cfc74d359b1191c05a5e56f5b17c546
font_02_sfnt_off00014726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1