Malicious PDF — malware analysis report

Static analysis result for SHA-256 c009a9071c8e85ac…

MALICIOUS

PDF

77.6 KB Created: 2021-08-23 10:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d50fbacf3c87a72273ea37e26c784ff SHA-1: 686fc435dcbfc497d9a45c1c8b6e3de24f851e1b SHA-256: c009a9071c8e85acdf0b798a4348b6b76caf3eace8eb7a65d8b4401a5e8dd7ba
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8672

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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8df9cbd4b---gibijivegejinizixadi.pdf In PDF document text
    • http://dansensvenner.dk/imagesfile///73723436800.pdfIn PDF document text
    • http://2440027.ru/upload/file/niseraxu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608315b6c3380---53931987558.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ca224eed9---66467784180.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/818e5af949c08f800aa9fb485d664d49/tatirosawosolono.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/24151160382.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/4407376124.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/30145323760.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ab1e57e11bf339f8f53526858757c986/87480232043.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0a2c111f---gawudog.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/41732202116.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/80548074133.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/65167564613.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cfbccfe0445d114c7293dd52b08c7805/90124980929.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/65582037954.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/25932317388.pdfIn PDF document text
    • https://anaksemut.com/contents//files/lajabezekululusurisitupil.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/rulow.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/39608956521.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/71800812276.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0a6a0e423---mawexumosek.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/46909149973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+root+apk+for+androidPDF link annotation
    • 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_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 17124 bytes
SHA-256: b3fa6a2f30b859273f46acb46e3ad3acf5c341544088fa6e4881f0b441b63372
font_01_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 10348 bytes
SHA-256: acfe0625c0fc4bfff25e3743b3e125c92177c71fa384b8e9ac68d16b7e3a59c8

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