Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d80e46e553407f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 21:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed8021acddd00aa5ff499131534b7275 SHA-1: 9656573d50bbbf9e2598666e464a78fc6d969b03 SHA-256: 66d80e46e553407f91875e255080d91b26bb024f7d4d02cd9846f55c727d952e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and numerous external URIs. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

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://pixomot.ru/uplcv?utm_term=pencil+drawing+for+beginners+step+by+step+pdf PDF link annotation
    • http://polyalpan.hu/_user/file/52916475065.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/3303510735.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/zusunoxexojifodegexuzi.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/nejovaluzudogakusavo.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/sawudomagemixerobaweniri.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/svjfmludg6li7fkvr9kifpmm5o/xototitanewodubezi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/wukonajifemujesipif.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/95062390784.pdfIn PDF document text
    • http://orenprom.com/img/account/file/10690347045.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/gegunirozojipuwuza.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6f9ff0db10da662627b39c0d755334cc/4164463826.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/16624588266.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/tifulitepivabalometamupez.pdfIn PDF document text
    • https://domilot.com/uploader/files/45847407063.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/tufoxufi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fcacbb21c---rapexesemu.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/2000039470.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/rupujesuji.pdfIn PDF document text
    • https://yifff.se/userfiles/file/46601957822.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/mabakubufofov.pdfIn PDF document text
    • http://hiniceshine.com/upload/65151511786.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78445c215---dewanusuzozavepega.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/vutamimapipilo.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/63275134114.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 11136 bytes
SHA-256: e918eaeda5f33e0f1c3b72c26643245215de40d144b76fca133765a5d43afd00
font_01_sfnt_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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