Malicious PDF — malware analysis report

Static analysis result for SHA-256 a406607e3056dbbb…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 13:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 00419346488d9dc692e9b8f125f01a52 SHA-1: 00f9509b69d06dc9c47b9971c0a7cd972addc5ae SHA-256: a406607e3056dbbbdfaeb27ec99ef4f49211a99a0e785c023c739303ffe6e834
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. Heuristics suggest these links are used for SEO manipulation or to host phishing content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7779

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://synerhu.ru/uplcv?utm_term=parametros+de+signos+vitales+por+edades+pdf PDF link annotation
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/mq92sc45ik08ltttsoraft8ki6/38459258830.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/11470071895.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/vevafajisifawukadaviv.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/16176505889.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q4l0vl48uaighh31efj96rt6u4/92714225638.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/10c5213e1cf38d78b6e687ad1b64bbf7/gojuxojumab.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/tokimatipopiliwajam.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/17312427371.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ed72fb6d07f015466852141d2c07f179/tuvifiretoxedodufoba.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb6f524af8---dipiwuzugut.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae97da5697---rokekotonukenibewowuvurag.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8b99255f---45315575181.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/gudurudadalasob.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0936680821---93295572419.pdfIn PDF document text
    • https://dcimx.com/files/lanejalebe.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/wugavatupira.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/morodevamosizuduf.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095b09083aab---tadozelogedo.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/tewopokatiwa.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c37f44aeedd---kumowetamug.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-30/20210730070508378420.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/65053309785.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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 18984 bytes
SHA-256: f647aebedf3e9a6eefb1841dbf5daff028549ce1a9f73704277f280711d6db41

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