Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aa749b4f3a092a…

MALICIOUS

PDF

62.3 KB Created: 2021-09-20 10:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9d17145906434e080ee08233d36fa98b SHA-1: d413085e76e62667e10fbc85704f14e760942968 SHA-256: a5aa749b4f3a092aba71f7515979b2f005f244571c7bba22ae27cac2ab7d0168
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to lure users into downloading further malicious content or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3246

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://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58938278115.pdf In PDF document text
    • http://cn-biyoute.com/d/files/24514586393.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/kimovu.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/32356423073.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/10140837789.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/goxorarojopu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613334e266af8---25354551072.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/jugura.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/24247462922.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/40770162096.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27dabf3f0---96515413580.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/52639945691.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/22708874394.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/gikugupeba.pdfIn PDF document text
    • http://glassick.com/userfiles/file/mapumup.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac37b3002---40081485711.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/37120454062.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/2531497429.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/leviwedux.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/kesegamodutojevizunadonom.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/kibadu.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/repawevugujefexofadi.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/ditafabaregamu.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/35403053189.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/80282571641.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/dobiwotidodomanuguxabi.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210904211722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+give+superuser+permission+in+androidPDF link annotation

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