Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7397463b7e51afd…

MALICIOUS

PDF

96.8 KB Created: 2021-06-11 07:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f5606a07c201d6b4f1b7c84a6c72f7ea SHA-1: 50186d5d848a1a196bb96a88454fc9614b7557af SHA-256: b7397463b7e51afd47def2629c059312bb749d13d66625a010f0770fe820c705
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest a lure to download a file, likely a second-stage payload, disguised as an English workbook.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9533

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://medvor.ru/uplcv?utm_term=advanced+english+in+use+3+workbook+pdf PDF link annotation
    • http://hopkinshigh1961.com/clients/878968/File/batojelikar.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d2c4b52164f16653ead1d5cc3bd338b5/27971976771.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/24690974419.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/838378383.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608380199b2ef---zurulasadakawofo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bbnuotcgv3vdribt8hg073bed6/60606739215.pdfIn PDF document text
    • http://arablift.net/userfiles/file/wakogafasanonasopetojor.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b954cdf27d---devagoxufugigaduzevuvet.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/waxuwezedoxujaxowube.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873abdc6110---nugarolaxepememuwom.pdfIn PDF document text
    • http://allycatering.com/userfiles/80141833520.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8eb0dcecc74031d9b2281a31f17f47fd/43363819383.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840f4352f9---15848046047.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/88b067ba45f312c5c0ea6881d4e6cae5/17951616455.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/41749966054.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/kovanugukabebojukagajoze.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3a068ab973c8e0a4cdcf5e40e5fc9110/75317095036.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/vjrq2bmes7hrvcrenoeog44kd0/tujiwubu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b08e4f45c---duterisegufoma.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b7e815c271cb718788bb186236f67873/22022918771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14759 5924 bytes
SHA-256: 2bbdd728faf635c5cd7871318307a2277f3a5576d57306467d2a1329ad5846a8

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