Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5d1ad5361991b4…

MALICIOUS

PDF

64.0 KB Created: 2021-07-22 16:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8d04a0cf8c3b21dd541fa382c36830e2 SHA-1: ea7f7756db1cb44306e85f1c4136ccafcad5d843 SHA-256: 3d5d1ad5361991b432ac8dfcfbce695713e05bf2637d1093a6def0680fa93d21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, with a high ML classifier score and ClamAV detection. The embedded URLs point to various domains, many of which are associated with compromised WordPress installations used for hosting malicious files. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9532

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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7558c5cdf---xinuzo.pdf In PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/iagpka8a4gehin6mnvo4k15ph4/sotubal.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfabd778fb---monowotatevegom.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b37cfaab8f13a7cdf1d1d3a4afd584ce/97164017429.pdfIn PDF document text
    • http://alltechsro.cz/files/91312145888.pdfIn PDF document text
    • https://mszukam.pl/dat//file/7974102291.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/gedib.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e8249ec19---kofopidalinokirujufikewu.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/kobasozivubekabi.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/mefilutinufezufufojelame.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/73755656170.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/29365372765.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/kugisifutunif.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/limamagepesasowapawufizus.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/33baf95881e1d87fcbb9f07111edc2a1/56545346524.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0597ee150388b0dc27822a2f83731f25/popaxizarefasaluf.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/kijetixavuledelubin.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908630c8875---19126667783.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/fupoguni.pdfIn PDF document text
    • http://iwort.de/userfiles/file/71090402144.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/pojanalag.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e170dd1fe1da60cc52419ac23ab451f2/darolimojasozowedizuk.pdfIn PDF document text
    • http://runo34.ru/attachments/file/1956209472.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/79666563980.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa12cb4d27---70786027625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=i+was+supposed+to+getPDF link annotation

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