Malicious PDF — malware analysis report

Static analysis result for SHA-256 8667d557ac37a328…

MALICIOUS

PDF

77.5 KB Created: 2021-08-15 20:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a5b913021a85560bf28e071a8d8e65a4 SHA-1: c5678fc863e49f1ac696227013d7bf469c80544f SHA-256: 8667d557ac37a3283dbcf02c4a741b8fdd0629857914c1faef4bd6e2ff9a2eb3
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 phishing or malware distribution intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=2005+tahoe+service+manual PDF link annotation
    • http://reichspfarrer.sk/file/faluzobabezewenizi.pdfIn PDF document text
    • http://russia-ex.com/zolonedesetoliwonusukij.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/umdg1mhleo338h0qbsldask3p5/15450464094.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769d3421e53---fefajukisizigopunakib.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b2fd8467c---70920600373.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/36924775540.pdfIn PDF document text
    • http://carszana.com/image/upload/File/rejogozivixasafixuner.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/1476765012.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966c7d3bd6c---24311028671.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/kizedit.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607be190e2580---pivejorupinogazarux.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/vebirenilorod.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7619d21ee---datomolu.pdfIn PDF document text
    • https://schmitz.cz/res/file/21074331054.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b7bnvfaarer7ophc2m08f2u9rn/45030911354.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/xokomegujedoruposi.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021060902230870554.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107ddf5831ac---lejufowiraruz.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/fileb.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/delevavozulazu.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/zokugosaveloz.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/77694857490.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_off0000ccc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 16112 bytes
SHA-256: 0757a830e01142d37bf2779d6f53c62f5acc30d60ab06b7aeba392f39710e1aa
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 10940 bytes
SHA-256: 64c4e32d9e4e64e095360a39e28aa2f45dd3f96be0732227a4c035c05688c7b4
font_02_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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