Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d4787ea0c5bffd…

MALICIOUS

PDF

74.6 KB Created: 2021-10-07 01:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f8e522f76ab56d1a0cca5dfc10705d14 SHA-1: 17e0f1ff1e9ef2094dfac5c7e14c6570b82f6dd4 SHA-256: d2d4787ea0c5bffd5b860beda20fc3442036b0c6b93f80d0e184ec4fecd5b2ae
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6437

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://ketchas.ru/uplcv?utm_term=50+sq+yards+to+feet PDF link annotation
    • https://saatyapi.com/upload/ckfinder/files/ronalap.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/ritejimuzepepukojovipij.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/xajebozebo.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/10875231409.pdfIn PDF document text
    • http://potlista.com/file/files/maguzupepanajegobanijid.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/86881913797.pdfIn PDF document text
    • http://thaide.org/userfiles/file/63164275249.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/wuvikegelagidodus.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18ab763eb488f8e2e0eda3fd9fc749fd/40122555895.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/91225711782.pdfIn PDF document text
    • http://freeski.hu/freeski/file/32296234408.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/vanipigafukatojogolu.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/4772606414.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/47447352817.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/guninub.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/43924159121.pdfIn PDF document text
    • http://chinahongji.com/d/files/jijidazazinigulusat.pdfIn PDF document text
    • http://nanopena.cz/upload/file/suxiwezemexexulomidel.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/6043258700.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/biwufolixu.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/mibafifazofoxedan.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/15059460201.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/gakafu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee67b46ea8---41167819601.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161580acf3ca63---melutagobupogeni.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/75281328381.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 10524 bytes
SHA-256: 649e3c1239baaf1dd43ec027fa732eedfb3e20d1cf49dc94917f430a0f83f6fd

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