Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ba99476017f138…

MALICIOUS

PDF

47.5 KB Created: 2021-09-08 14:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 221186c0344c8442d8d4f6ed16b8c57e SHA-1: c6644d65d4194972e33b4849e6155d93526c9a17 SHA-256: 35ba99476017f138e538483b8cb5b5f2b16e85411f1d60cf7f550bc674124896
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, indicating an attempt to distribute or host malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7102

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 http://www.ciesol.es/ckfinder/userfiles/files/gorakafatapepumolukibi.pdf In PDF document text
    • http://phongkhamthienhoa.org/images/files/zewufofutefi.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/negojivonijugu.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/risopesoxotopuvebape.pdfIn PDF document text
    • http://xenangheli.vn/public/files/28645859215.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/digovajopuguvukuk.pdfIn PDF document text
    • http://toroisg.com/public/images/files/35264859799.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138627042162---tojatuxeditesufu.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/3302552612.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138374fe27b4---zoxaluz.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/80540183295.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/2196028851.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/tudogixawitugamube.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f48b9e563---68977616056.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/9463339196.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/80921699578.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/dibesepolivipiguzelepanal.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/topapopak.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/norakurukob.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631037013.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/89587125935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=little+red+riding+hood+pdf+freePDF link annotation

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