Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbe5fb9a25d0b52…

MALICIOUS

PDF

47.5 KB Created: 2021-09-26 15:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3a83e8342fff4afe2534db63954dd56 SHA-1: ce684a4ca58ea18399fa570f8f68f05e8576e108 SHA-256: 8fbe5fb9a25d0b52202ce01ccc4bf2868fb18e0ef3a47fbe98b8cca157e48497
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving the execution of JavaScript to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5960

Heuristics 6

  • 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.
  • 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 https://www.agencesramos.com/ckfinder/userfiles/files/zakuwinatozaj.pdf In PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/lametani.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/vozatavejexek.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614d004e36cb4---49558158043.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210910224447.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/mubopozogiwajogus.pdfIn PDF document text
    • http://caythuocnam.org/images/files/41516458052.pdfIn PDF document text
    • http://cycling-software.com/files/file/41836867814.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139622ce3d5d---80328263931.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/mirogedijevotefogun.pdfIn PDF document text
    • http://mama.plovdivweek.com/js/ckfinder/userfiles/files/benasigokigum.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/448de7de2bb07c8c6bdf9fada1b5aa99/53693625923.pdfIn PDF document text
    • http://ariege.proximeo.com/ckfinder/userfiles/files/54720193517.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/52522517099.pdfIn PDF document text
    • http://indah-education.nl/userfiles/file/59884976830.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/13560440448.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26deb8a79---zalepamilarupoliketogeg.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/rofojilogapatizu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/mirazubonamogobigamorilo.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/31730819557.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/fodolazate.pdfIn PDF document text
    • http://dalaichau.com/files/87841788911.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/23077895319.pdfIn PDF document text
    • http://c-six.it/userfiles/files/gakenovaxipigatewofidob.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/47688782544.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/2125354654.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/zafixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+java+create+filePDF link annotation

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