Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6acc86f66f29b17…

MALICIOUS

PDF

70.5 KB Created: 2021-06-29 04:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 367fd1e1fd3c980a586c0972139d1a8e SHA-1: 08d75e9f48f02a1e1c109f5d4a0d29759176107e SHA-256: a6acc86f66f29b171a96da123db0d4528eb20892ad15fc792da0088e58ca3403
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. This behavior is indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support the malicious nature of this file. No scripts were extracted, but the link farm structure suggests the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=ct+guided+paracentesis PDF link annotation
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/49742ebe6e2309a7c9c7e0b0d47b0a35/kofixikewovijobirujuti.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/41292629330.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b3d121080a23ac5ca23313ea5fa818a7/82828804574.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/9208326333.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/80458e5368931f0a56580675196b7a60/pinonexoruwusogubafalik.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c8e31cd35---83414782264.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/91351565031.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/87dc689c1be60ce809ad2afd9b7325fa/rowujiruk.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/059d6ac13bd4f1a766156a09ad599780/milidatipibi.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/c59480d01d8c8d81fc6561b42d6391ca/xezuradiziji.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774768b81df---10381636125.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5110e749f2caeadae434cd0a30c73150/sitizosazuviwurewefuna.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/33809824695.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086baddbc69d---vuvavopunolowe.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/gifokirig.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/95429369148.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10e1a7570---3198879714.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7da2caea3---92032714064.pdfIn PDF document text
    • https://tavio.ru/files/file/lofabasumepiz.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb78dac324---jatujisuxisatel.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/52955294725.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec6a27991---dolazemavasapajad.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608979d0aadf8---fitunon.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922dcb519aa---vajewobujedek.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/crm9s30q30jdlo7r4r05v5aqfk/860419594.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1