Malicious PDF — malware analysis report

Static analysis result for SHA-256 664131c79b069d60…

MALICIOUS

PDF

79.5 KB Created: 2021-06-09 07:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f5a73d44f57a4841e1bf122c6f1db1f1 SHA-1: e7ad3da292babefa9ed9216af9061ec09c5425b5 SHA-256: 664131c79b069d6032d6268de4c8cdb81768b9b3d95b005553d820f3a4037b84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body's reference to 'revert to a previous commit in git' is likely a lure to entice clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=revert+to+a+previous+commit+in+git PDF link annotation
    • http://kururlaub-ungarn.de/bilder/files/posunogegitasaponogubego.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/hv969u9bg9i7vrsn2nc148ju0i/31140399420.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/7299972544.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608601f5dc1bc---67514114388.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/112e60cd6e6624baabd85d9717439664/34732102629.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/fawesewofu.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/28502821845.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/27515578777.pdfIn PDF document text
    • https://banghenails.com/upload/file/vakizexaxagifiwunibekafab.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/48588905994.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c29615ba5638939f1651ed7a31cac787/damolemuvomujomebapo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d2c39373---tejusukuziluvomezo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e887328f5---zobofarupepowugegenu.pdfIn PDF document text
    • http://tms-operation.com/upload/files/nozilezosojirujoxi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f34206d7a---57577289781.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/jogif.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeb0dd40a5---kefexofifexizavowalefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 5168 bytes
SHA-256: 4b1dc1386b699541498ad8998deeef8b5b0e39493f5c80b9ef35c7a0b8eb6fdd
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 2744 bytes
SHA-256: dae0f12506c17deaa818396cb86411da2f7a72f10e575d6fda98e021880a3e82
font_02_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 10268 bytes
SHA-256: a9fca55378f4ef97fcd7665d49bae679cd51b7903f57874e7fe6dd57ab71d32a
font_03_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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