Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09dc7a1cab5d2a0…

MALICIOUS

PDF

89.0 KB Created: 2021-09-07 09:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c2e3980b0df6d1a08c83d6d0cf718f2 SHA-1: bee614dd8bb5fec56734069bf47062bf4817cddc SHA-256: f09dc7a1cab5d2a094554f384baa38d10593133f041190cd19ca984b62a59bbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, identified as a link farm. This pattern is commonly used to distribute phishing content or redirect users to exploit kits. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=cnc+programming+course+pdf PDF link annotation
    • https://slezanie.eu/userfiles/file/lojukowulemizawozumurab.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9e978e32f0b8b63b7f4698dae9d19382/joxipegarul.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e88e0ed724afa7270cffb68805a92a8d/90402209175.pdfIn PDF document text
    • https://bio86.net/fichiers/78220263542.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/nuvuruluxujisavekilupijev.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/fefejifi.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/pukuzuxivi.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/voluk.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/vutogibanofagafuxumisoz.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d5680b997f5---xubegofajov.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/wujemojuvali.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/29468491511.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/lonirejotedigoziruka.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90ed4d187a---32610475291.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/jipofubi.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/97365352349.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kenakutadaroroxadirer.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aec4b6a18---29082853147.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/67975987837.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160802568dca36---badurogozazosudesilo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef44b6005---79494469501.pdfIn PDF document text
    • https://cargobull.cz/res/file/61735879329.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b65202ea449---26583574641.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_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 10948 bytes
SHA-256: 55e47ad514014e9e2181702e760646e1ce5d0f3e7cf3ef624bf5b42eaca33bea
font_02_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 18040 bytes
SHA-256: 3ab54e3d277c4de47a179b2eeb85d3734645811918f5391c02769e6ea421469f

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