Malicious PDF — malware analysis report

Static analysis result for SHA-256 6922c5d6d4fc6455…

MALICIOUS

PDF

53.6 KB Created: 2021-09-23 02:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4542ec436ade9ca3c89a3fa779762f71 SHA-1: 394dfc0e29654dce5e261daeb9cffaabfc28dd0d SHA-256: 6922c5d6d4fc6455f7dea19cde207597bd9e35469150b6a7f658bd2d5020cfce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8785

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://smidgel.ru/uplcv?utm_term=online+instagram+viewer+story PDF link annotation
    • http://motolargo.pl/userfiles/file/janizogivavun.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/rakuna.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/nojinebopegovimi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/buwopijowupevozapo.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/7454109536.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/98905569950.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/limukiruvoreni.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/jenedovepumalova.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613042747623d---35578494840.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/jisusasubijepado.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/viregoledodalonuxif.pdfIn PDF document text
    • http://autodilygood.cz/files/file/duwipiruwudusiguxuvaxa.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/sazut.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b53cabbea1---46257082068.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/kofodexizugadunofomexove.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/dovagutuguz.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/6955437603.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/52397570881.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/97243267636.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/86010253832.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/66131009724.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149812feceaf---kidada.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/jefasojiwakinixuxo.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/47217651021.pdfIn PDF document text

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