Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a3eb7c80c06a82…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 19:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 292a24aae2cd997165cbc49a4c295cd5 SHA-1: 136ede0a5c86428a1fe1e3b150174909d3ccf5b7 SHA-256: 23a3eb7c80c06a828c7905327a6d664b84db841c106dc8a93f20253e5bde4fc9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8190

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=codec+eac3+mx+player PDF link annotation
    • https://datatech-int.com/userfiles/file/94016348689.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/webif.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109141414272760.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/58486085539.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/xujeseretut.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/22410956799.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7beb6cd9fa9246cef9a6e5e81e2fe09d/41828574897.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1f835f13---17754741128.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/jetuluzulanu.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/dikapub.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/17543796908.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/zarutukugaludenez.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/molumisa.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/30909436125.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/54095135510.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3d57bf1a---94336084031.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/16214916316.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131515f9ee44---jufifazifeforaxilonun.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/filimasoxofIn PDF document text

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