Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3624cb4c49184ae…

MALICIOUS

PDF

54.7 KB Created: 2021-06-20 20:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 97d42bc9e06508459d64f9668399b085 SHA-1: 371e9f19bfad61aada9ec5262dc97636b69d3736 SHA-256: b3624cb4c49184ae2b4c45cae4f2f07d5f368a32abe61492a92b12df48c37ddd
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms and disposable domains, under the guise of a popular game download. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7444

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://infrive.ru/uplcv?utm_term=fenglee+attack+on+titan+download PDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/112055528655c06bff51b3fb60e64914/28111674694.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1796523764608f4fdfb98e0.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/51907421.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/95057826900.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b129626b8---49014225062.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/maxagox.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/38878192955.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210522083348659.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/158d241cb5c82e5f0b5669435b09fd9c/23071085854.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9c9c4ec7---boxorube.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/tpirusa4l0ja6j97v8u217m265/82787867789.pdfIn PDF document text
    • http://kbchina.de/upload/migedamovowonolaborini.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead7827623---tiwapo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160873ddcd0d1f---63226951675.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/denosujemive.pdfIn PDF document text

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