Malicious PDF — malware analysis report

Static analysis result for SHA-256 309946d0b8f72201…

MALICIOUS

PDF

84.3 KB Created: 2021-08-29 01:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c71ba1a6d32ffef6d139a85ce4143bdc SHA-1: a942c5db493c05e3b4e063b24f703ef6369d1b47 SHA-256: 309946d0b8f72201e18dee0c080f3086838b7d7c15a8c4365a434cf6a9b241ba
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 0.9985

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://coretry.ru/uplcv?utm_term=one+tailed+and+two+tailed+hypothesis+psychology PDF link annotation
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728fbf9de97---77201383571.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ef544f7416c0b392ef3e1fa113a08651/41929634823.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lumufujuxetokubila.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/02f85aa10ab12522fcfd21a103459f50/66993329457.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/75830396844.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/74844420680.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/46074491832.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/15009820113.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/75087295336.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/pidaz.pdfIn PDF document text
    • http://ahchala.com/img/file/kigeloxatotodesupanosaxe.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/35924055016.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/zexitunamawudoxigeputi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q4c0lpoha874tj39mj6i9vfll7/menagafefepogixerifesa.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b374570f731---gudufanom.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/21243754296.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/k28mie7tiba794ru7bqc22rp5d/semuvoko.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9f33ece6---56727225895.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/niredanedozilevibiwe.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/50133368799.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/o93invcf8h5s51lrvvnplu5se2/volisalimipiluwewi.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/9610085097.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/53840157828.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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 18020 bytes
SHA-256: ec45b2ae77f95456f06ef54ce5ce73d55d2b9f1f34fa81d577b5e5edfa8dbca6
font_01_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 10920 bytes
SHA-256: fbf8cfc844e36942e2684b22dd1920675b3c0842ad8743688876a58cbf7cb350
font_02_sfnt_off00012a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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