Malicious PDF — malware analysis report

Static analysis result for SHA-256 f790d55ad9853f67…

MALICIOUS

PDF

62.5 KB Created: 2021-10-15 13:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5079f1dce79669fef322c4844d458819 SHA-1: 7cf6ae656ba5b01e08e1e275855c014470543504 SHA-256: f790d55ad9853f670413738621bef1c99b87827a2ca76c482b57bf8451656f4c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including a link farm hosted on a compromised WordPress site. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are designed to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9009

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 https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7ca03a11744cf8391db7a84625bebc62/bezub.pdf In PDF document text
    • http://euro-ex.com/images/blog/file/87067125166.pdfIn PDF document text
    • https://kaparatt.com/images/File/90047223981.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/56063390544.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20211005004429120.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/dadegemubos.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/wujifufirexara.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/73269683023.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/vulawuxug.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/36870320680.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158f79683925---gikazope.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/zibaviribuvagewat.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/35765603711.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/5965650876.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/japozow.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485f16b2f2f---43708318698.pdfIn PDF document text
    • http://ustunongel.com/image/files/38886729597.pdfIn PDF document text
    • http://enewind.com/pliki/file/dugumubutejeko.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0ba415f46---81226576400.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/89987344950.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/95686604721.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136511fc51f5---zatinoziruwerijeduwuvufaj.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/85228961250.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/fazubufap.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=gta+vice+city+for+pc+apk+downloadPDF link annotation
    • 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_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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