Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff3d3e66630706a…

MALICIOUS

PDF

51.5 KB Created: 2021-10-11 21:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 364331044ba90663713b0f9aa1e5df38 SHA-1: cf4a7ad6a1c0a44453b0a95bd376802cd495747c SHA-256: 5ff3d3e66630706a7a8cbd86beca9d7fe1ff68ea6beef2c8e737d88c577813a3
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6796

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=cm3+to+microliters PDF link annotation
    • https://laetitiabernard.fr/images/file/81712882064.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/37315933227.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/55204570362.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/50396228724.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202110040017532373.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/jefofomijoki.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/xazobepomegafimewil.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/18004168370.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c7856bf8---kesodafekewog.pdfIn PDF document text
    • http://labonscafe.com/userfiles/nikabin.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/jolobazuvafijuxufezes.pdfIn PDF document text
    • http://strap.sk/uploads/file/18361483923.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/rasuru.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/16102667434.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374852decc2---refubamur.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/21328212479.pdfIn PDF document text
    • http://zamgph.com/uploads/file/14190135480.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613327878c74a---65065318717.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/berisulubutatakotivu.pdfIn PDF document text
    • http://santabruna.cl/upload/file/bitepaf.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/sanopukuxaruzemita.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16158a53d1c563---45971623216.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/39338947587.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fbc1e40550160b812ebcbbfb1d2691bc/janipoguribafabof.pdfIn PDF document text

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