Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7710068c687d29a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 12:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ded9c1979beaf509c3b36484dbc9516 SHA-1: a8a65653391aa5509b98a022fc98997a29022264 SHA-256: e7710068c687d29ad8f472383b6127e9b2e94dde2e98ddb413cca46cc8e1a179
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm. Multiple URLs point to compromised CMS uploads, suggesting an attempt to host malicious content or redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9178

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://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c3c437ab5b85fb29c6d2e41468ae6e79/sonodagejazukux.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b09f11622fa28965d0082766d29516ea/nudajemavakunulitijemez.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071313253a1e---kotilifopomalun.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f4ef094670fea402f93df85cb14c10c9/18101783371.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8e656e367b031a2362592c0131d0e690/rafedesekili.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/wirakabojarenolisi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610eba1e979b6---11882666513.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/74188639211.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/83165793884.pdfIn PDF document text
    • http://precisao.net/files/files/polanoj.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/48248328113.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/nivaforozuzulejelu.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/fefepudofadan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db01e312ef5---62243896105.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/75278040029.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/kivokeperijekilaxekug.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4af9d6fc4---fumodikuvaveragolepiz.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/nobapoliwapefijenobogit.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef3ba5298---lasoronafulurozarufosoled.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/rivunigesubelivunulijoxif.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fd0d4ca286019de1b6a0671518c55cef/13816820676.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/74191977721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=possible+zeros+of+a+polynomial+calculatorPDF link annotation

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