Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3e4e00230a4588…

MALICIOUS

PDF

50.2 KB Created: 2021-09-05 14:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ae598b7ca79bcdef0bead465f704b97 SHA-1: 52a00cebf5a4f7e7ba15c84044294cd43a3d78fe SHA-256: ad3e4e00230a45887f010c56c82ce5fb6aaf1588af9aa0891d9f38ea7b864a5d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign, likely using a spearphishing attachment vector to distribute malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6227

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://synerhu.ru/uplcv?utm_term=marcus+aurelius+book+pdf PDF link annotation
    • http://korvet-sp.ru/userfiles/file/vobibebowexesoz.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/lasufeluvovuwebi.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/15704418116.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074884ba90da---16099403000.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/78060360966.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/191d59b14354cf616ca131b48a594569/mibilol.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109030452072134.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/zakukiridelimipomujakano.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/tuwuvofuwotal.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/belubizex.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vs05voqrddpm814cpvt8ujpnd8/kalunejopamexuxo.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/pipofafogoreri.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4220dcc9d---80639080525.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/fc42d831552e0f6ce400fab6dc340f74/gamabatademofinoz.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/werusejukiwozuxivi.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/153fbeceb8a67a9558d8bac46fcc9288/monebifomugos.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd1aa8d1f3---95182848446.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/51598671986.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210605105423.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gvmmfk5aotehm30k2k7tp04pg0/witevekesuxumifoluv.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eu9brkc6gpimkgup30sa2fnt63/15051545665.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/gopufajakiveve.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac239634ded---18995270588.pdfIn PDF document text

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