Malicious PDF — malware analysis report

Static analysis result for SHA-256 f298e8266f88350b…

MALICIOUS

PDF

69.2 KB Created: 2021-10-14 21:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bcdf08e6cd1b12e984998d617702edd4 SHA-1: 8d8e95341edeccfee31945ba66e748a3097efe3f SHA-256: f298e8266f88350bd3ffc541c9a54bd1b0baabc297bffdec5f3b2824b9927052
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is commonly used to download and execute further malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate that the document links to compromised or disposable hosting, likely serving as a distribution point for the second-stage payload. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4816

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://weifong.tw/fckimages/file/xujaji.pdf In PDF document text
    • https://officialbacknumber.com/editor_up/75219430273.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210922_158AD0064EC30CBB.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/nilopuximaperenotafafosap.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/donewetijikizumokamov.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/mejusep.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/medob.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/84d13089739f6ed0b31b0b2e4a8ceb79/61111536961.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/30934816912.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/ketasafodevijifipez.pdfIn PDF document text
    • http://halmar.info/userfiles/file/sudovid.pdfIn PDF document text
    • http://chikatere.com/Upload/files/biwafinulinufonigogurotor.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904171426.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/lexegusamadawezobaf.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/59187601863.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dce259b5795ca17f94820ab349cbb355/83979646764.pdfIn PDF document text
    • http://greenpeace.aboutgiving.net/sites/default/files/editor/file/71403461571.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/8618827422.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/jedafidikiv.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/9091873507.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/sibuxalomiredatugijijozo.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/gifebixapidetumolon.pdfIn PDF document text
    • https://techlan.pl/files/file/nokifaxoda.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149088c94890---jivikunabimufigodox.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/12342501135.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569036c06c---32347370240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=vector+background+eps+free+downloadPDF link annotation

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