Malicious PDF — malware analysis report

Static analysis result for SHA-256 4933ca67eba2f5ec…

MALICIOUS

PDF

63.6 KB Created: 2021-09-06 03:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9b89bb1661d25695173a492bef937c2 SHA-1: 1a554af399f7f90bcab31bf38757f6d689498b84 SHA-256: 4933ca67eba2f5ece6821db6369b6c8e88829d2a18661312994d7850cd571d14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6902

Heuristics 5

  • 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.
  • 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://gemwares.com/userfiles/file/nutomutoxit.pdf In PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/fonaronafira.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/63406461117.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0e971c37961845e34f46f4a774d21532/29058992839.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/jisow.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d3cd5440326d9a702ce38950cc34fe5c/zowoziwevoxebimijeti.pdfIn PDF document text
    • http://unseretochter.ch/images/file/pikugipuledikekadijid.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///zupabibatanokusutozemo.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/14070303562.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/tc4l09hp5ts2dp67oh4guhlb64/94903242518.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/fotifixamosefonojas.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/3199118540.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/860b4674d4e5fafdd1583ecd1d086a3b/60884835892.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160771f31f2ae7---wubanezosinogeveken.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/8947965460.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/21775818633.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8scrfrt9jjvr8h1pp0kbvdpahv/pidogubirukajebofaverire.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/mutadufotuxabab.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/losufepijitenivulafidefek.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/52524751634.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/lodetujegisowamofafalem.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/84167281432.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/nimogesijulubotumadagunuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=list+of+abbreviation+pdfPDF 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_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 17336 bytes
SHA-256: 5a5369f8f00bedc8b9cbe78b4d80d843b1a2bb48c78d4555f66f48b24d39d82d

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