Malicious PDF — malware analysis report

Static analysis result for SHA-256 2768475ea6f80b11…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 00:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4005fba5407bd1a635c25cf04c8e4bcb SHA-1: aa722369e661164c6302c1c1e27c878df2508aa3 SHA-256: 2768475ea6f80b11e3a74687abd023f5d246b775a70067c8d00e5ae039a17dcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=like+a+house+on+fire+book+pdf PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e4cb885ea36d5405ba65fbbb3b9a140e/31460289942.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3e7ffef7b2782fcaa5efb17ea295e9c3/51940617660.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/72175443642.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/66115830814.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/36915069445.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/sisijewume.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/fopaza.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e4c4b75c---51648172803.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/rumoxunumaz.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gulaki.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/velozubovaxoz.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b58168ed4---28807632812.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/7768915896.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/garibo.pdfIn PDF document text
    • http://poiskvod.ru/images/file/45864656140.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/80912067549.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609334dbdd0de---jeburov.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/boxutulipefelorefudu.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/gilugebunofelalosorafunom.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/xujis.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/99721543058.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/tekuzewilalav.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1611527415fa84---nilesedanomiku.pdfIn PDF document text
    • http://ametansk.ru/uploads2/sakejefibudilamobe.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_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 17752 bytes
SHA-256: 76682cfcb5d044a68cd8b4d96da5cd1cbbe6ee63d58c26f266f4b67e98f6da7e
font_01_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 10740 bytes
SHA-256: 2bb6c8bc854734c489d9505a486961dfd3a46c3e27bb90b42c8001d5b0bc8619

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