Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b053e760c20ac1…

MALICIOUS

PDF

62.3 KB Created: 2021-09-24 05:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 122af137713bc53fcaf345bc13420af1 SHA-1: ba2901787e74e7e123d389ab8d07c06c4f562c66 SHA-256: a3b053e760c20ac15008f7a2e5b23e4d1ab2bfc98fb2255febe9b36cbd4b7b8b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4857

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://crewmak.ru/uplcv?utm_term=mafia42+mod+menu PDF link annotation
    • http://stressmanagement-karriere.de/userfiles/file/95435053954.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/49105143734.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0599a3d62---93193362436.pdfIn PDF document text
    • https://norservis.info/files/files/kavet.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/fawuvakanijisafipatij.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf5745cc87---43880131789.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/dawedotesuli.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/tuxokefes.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/favejefosutafedi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf3820ebd---novudawimomupuwafe.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/26162378428.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/64385124472.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210921_165940.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/likedoguxuxavu.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/kovoruvesanogim.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/ronupakivonav.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/61246583304.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413af7eb659---57270305228.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/47233726853.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/jiziwutaxisaka.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/fofogulukupodubureravijo.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/belizobaratodadezi.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/73280272864.pdfIn PDF document text

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