Malicious PDF — malware analysis report

Static analysis result for SHA-256 3867a9a758383406…

MALICIOUS

PDF

94.2 KB Created: 2021-09-06 08:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ca8378749c7398595554b123b7f1fe3 SHA-1: 2024a706a49f5285edad87effc8faf88fcfb95c0 SHA-256: 3867a9a7583834067fd38fbf9f9e3330cc7b9ebeb0bd61b9783144b458d239da
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8310

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://laborke.ru/uplcv?utm_term=middlemarch+george+eliot+pdf PDF link annotation
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/nobowawifunigagug.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/6187182437.pdfIn PDF document text
    • http://homeopathyhk.com/files/farofuwipagemumonikewavuf.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/95473519986.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/52f969b9f4eb8b30a80eb9fa9125aec2/zerobujabumufadisi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6c3a64422cfb36d2b989a08141625866/4613664245.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/gawelaxedipururino.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160767d008ea64---17273768022.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/palesege.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/alfposrki27t4fm3tf3mmnbffn/rotafu.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/zosaborulonej.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210622_175231.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/89026625226.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18c4b95252b66c6e503787bce840738a/suximakoxafuxodinuruvo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3605beae8cee911049c502f74ae61d50/33207548160.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/sekopovag.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b18673e19---31049293571.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/42134747122.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/89100858860.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5fc7d13dfe0d79570179abebb108b9e5/ledam.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/disomibopakozigede.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wivaj.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f65abd61f55005f12b2bd714f12f5d04/kimipulonatuzesibuf.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ba4c579333d15cceb05d4a9c2b5ac11e/wujibigikigikogululufi.pdfIn PDF document text

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