Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c561178639b56a2…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 03:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9dbd3442912fd6c7ce6b56f997912dab SHA-1: aa87666a9c898cc927223bd13e13e2e07a2e1371 SHA-256: 2c561178639b56a24e30ce234761b39e14fedc5989cc39e4b9223c2831731cab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6240

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 http://kasystemofkarate.com/clients/861259/File/xekenovowefo.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a60f71c9c79---garudevurukexi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/04d879gt31vl0s893o235g4ia9/11285053020.pdfIn PDF document text
    • http://klhl.com/userfiles/file/sivifebilovupadekuxiw.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/24995439011.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/14412995297.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128a5f21c8c1---10240697648.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/16741453803.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c775f2ba9f8---45688704496.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/rkm3oco3kakuk3c5a08iq432honoh41f/8737656654.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/k1kck245m47sb4hd5lbjc0cf3d/sesosejogo.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/30100600522.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611784d06c56a---feserajit.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/29393193675.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/kozurerogafevobifot.pdfIn PDF document text
    • http://mousike.it/img_ins/files/bawafutekegekemosopuz.pdfIn PDF document text
    • http://186086.com/upload/files/tidosarajefipodu.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/31937796378.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/sofurirow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a937ba288cf---67947410234.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/13447539729.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/53542da1d393bfebd56a86317217fe64/41157608815.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/351cba8678933f4769d4077d2b7ce7d5/65885171575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+captive+prince+read+onlinePDF 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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 10472 bytes
SHA-256: 5687ca3367f5cbee8b7d2bcf655a5224a476e7d42ba1e63fcbc7d63d678f928f

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