Malicious PDF — malware analysis report

Static analysis result for SHA-256 66305a56426604fd…

MALICIOUS

PDF

54.0 KB Created: 2021-09-05 14:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 584042383de1c62e568b28681415de05 SHA-1: 919f44bc6ec486c3345c1d107bff4b2dee235fb0 SHA-256: 66305a56426604fdea442a31171df7ca1a955e0e2106143921ae9ced9f38b642
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5782

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 http://studioriboldi.eu/userfiles/files/96706784073.pdf In PDF document text
    • https://aymsoft.us/aym_image/files/8276666652.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/jelavevomopunamedobejamo.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/64763475095.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/vebidonomafisemowoxar.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lek1nsonpup3jr0ulhjhcjsk37/xixexovi.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/pujafodegedirutofolexuru.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/75001935600.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/lugijonakosox.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/91568336232.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0511a9bf4---nasujaresumob.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2108082119447837723hmf2so8mr8n.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/geforojubomolutug.pdfIn PDF document text
    • http://abnicum.com/files/file/gusox.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/65010083069.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/7daf264327ea45208df67c37ad386374/sukotegodebuzibim.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vp3pghep60jfjeres3824904ne/xunavesedoxerepulugu.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/12157302778.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/20246409669.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b44a138e7ea---94651420971.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/71314275145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=python+syntax+cheat+sheet+pdfPDF link annotation

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