Malicious PDF — malware analysis report

Static analysis result for SHA-256 f780464a3330e7cd…

MALICIOUS

PDF

68.4 KB Created: 2021-09-17 06:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35cc9bc4c6d2828731e63946fab98446 SHA-1: ba38200b7e370703652ab65c16a6fdf22fbba77f SHA-256: f780464a3330e7cda37edcddeea7db922094845d7a6748ccabcd54ccde41e4cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many of which point to compromised CMS upload storage or disposable hosting. These links are designed to redirect users to potentially malicious content, likely for software download scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=gta+v+online+pc+download+free+full+version
    • https://mraos.com/web/userfiles/file/ritonapobebefexumimanabe.pdf
    • https://divanich96.ru/admin/ckfinder/userfiles/files/3552715998.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130686ed4dd9---videzogitukuzojefapa.pdf
    • http://sportsclinicwest.ie/media/contents/file/niwizuvuxi.pdf
    • http://aczelzalog.hu/tmp/99382097783.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144022cdb3d3---57624405166.pdf
    • http://1day2night.com/UserFiles/file/77224469394.pdf
    • https://robodom.si/files_vsebine/78471286016.pdf
    • https://kultmotor.hu/images/files/siwuzos.pdf
    • http://alnoorcity.com/userfiles/file/tevusor.pdf
    • http://svatba-emi.com/uploads/pages/files/tixovisorafexiwavutofi.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/1836736667.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/wipawipavidusetufa.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/53218027961.pdf
    • http://oreade-breche.fr/userfiles/file/82132265616.pdf
    • http://tubesealer.com/uploaded/file/155143361361373aeddd898.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/7310412012.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/rogejurepe.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/zamefuvisadifuxisedunu.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20210903_68E423C377483399.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/k14gr6b9vesb7j82eqb4fme5r6/27139302113.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBA 16792 bytes
font_01_sfnt_off0000c6cc.bin
e83be2b0f69a893c74718e5e3300662f430cfbee12a5721131ede523286cccc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 14332 bytes
font_02_sfnt_off0000ead7.bin
1daf7aa8517c6c2f24da9567ae4c35f059767176c5da81b4cbcfac1d489902e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 10904 bytes

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