Malicious PDF — malware analysis report

Static analysis result for SHA-256 96910a5fe7768ecd…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 18:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e9a51a1e187da070744e95ca759dbad SHA-1: 457000cf4ddfc737bb8dd317e9a135b7d7d7d890 SHA-256: 96910a5fe7768ecd1612a4217b19e23771b6826625a2c455979c2c178f445d9e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple domains, many of which appear to be disposable or compromised. The embedded JavaScript likely serves to redirect the user to these malicious links, which in turn host further malicious PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8430

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vstarmp.cn/upload/files/20210906_015519.pdf In PDF document text
    • http://smitheaster.org/clients/861344/File/75170493294.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc79d6aa8---27924549614.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/74376373878.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/gezuvukumobibalogek.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/devexunosobemofizi.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/gr4k820lscmtjhdvjb7pqd7k7k/xexavoratamebowur.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c88969289e---wotexeb.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/98049509194.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/69301804797.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/vagutije.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/xeneselatofaropafofuv.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/kejubozedar.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fc0ea73e1---zuregikipunagurul.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/27397849445.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/71998500183.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b231bc2fa---nobuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=honeywell+lyric+owners+manualPDF link annotation

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