Malicious PDF — malware analysis report

Static analysis result for SHA-256 3627836c3cffea21…

MALICIOUS

PDF

69.7 KB Created: 2021-09-14 11:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69f16e384713c76bb0368b84653642b7 SHA-1: dcabf98db64fd8eb5365c084fcafa3306811f785 SHA-256: 3627836c3cffea21f5b9e7b0daef65013abec057be319eb845d6172b141a296d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and the nature of the links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5360

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://medvor.ru/uplcv?utm_term=seo+difficulty+tool PDF link annotation
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d45b9adcc---90455737971.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/75730171088.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/jekiwixufukaja.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130c00695315---18789198361.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d67071130---11428468261.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/29015747627.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/juzovatasulob.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/tufiluzovadelamip.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630543941/files/firetomenedarilubisizoka.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/linatapazuro.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109062245492250.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/vokigotimumisujanilasexap.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/zekepumuj.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/345e48fe1784c5a9c907b33c21eaa7e8/49856717413.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/35600272675.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3d6e0932e4b140ff34ab6a18b6487b4/vobewupofazute.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/gabudi.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/rimuxozezaza.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/ximitixumera.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/faledevufudokosake.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/dojafudabu.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/wominivule.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/fexojubam.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/pipevataguxibibagefot.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/63199084877.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC030 10224 bytes
SHA-256: 9cc134c3c4b052072e65cad92d5815b4e36da0dabc46492144943425605422e2
font_01_sfnt_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 15896 bytes
SHA-256: c46cd0d309b175f564b47a91c9891d7683b90819b470b67b0c9b84cc02f92530

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