Malicious PDF — malware analysis report

Static analysis result for SHA-256 5506a2c2b2e3ec2c…

MALICIOUS

PDF

63.7 KB Created: 2021-09-18 15:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 399e3e3a4e9e777ac72d0e5f2e98170a SHA-1: 93cfd32fd7c614ce1f2aef7e35d3866c67783b76 SHA-256: 5506a2c2b2e3ec2c68427c5f05de317279298a5fe38a05f6457da81163ce380e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially on compromised websites. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable, but the presence of external URIs and compromised CMS upload links points to a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6241

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+start+setup+wizard+android PDF link annotation
    • http://kaie.org/userfiles/file/20210912142308.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/62297828427.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/1004472775.pdfIn PDF document text
    • https://digireg.es/upload/39678309384.pdfIn PDF document text
    • https://anup.bo/images/files/rukoposovelewelifinu.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/4041482026.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/kewederi.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/87547318439.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/nufezusepabopivufipan.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffe267411---42464633968.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/jatodu.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/nogukefupaxalelivune.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/1398468123.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/8446324754.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/kogagojosaremixipot.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/6610739288.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/goxivulelorodafoz.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/98455830718.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/88512040194.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614448512988b---fofuxatul.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/c9bl9qe715rs95uc93ruuju016/19180008768.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/71256308741.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/3115226757.pdfIn PDF document text