Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b218c035dcbe17…

MALICIOUS

PDF

70.8 KB Created: 2021-08-14 13:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1202d79ca4cead0d9a82a2ac991550c8 SHA-1: 03cbed218887b8b63d0169f26504df8432a065b3 SHA-256: 78b218c035dcbe17015a65cdaedf185b970e6f2a1bded8b5f53d414bfc3a8ab1
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9638

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://chuanghuilaw.com/filespath/files/20210813100407.pdf In PDF document text
    • https://wonkingchina.com/d/files/95874245296.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/24700061719.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pidukakojivuvuserufadolub.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2pdrhrielr2k1tuekavfi076fk/1226308139.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a78a25d2---35108160685.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076764fafe75---78611670797.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/de6126c9a50980d833271dfb03fafc89/32936009145.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/33060066787.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/gadukux.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/46995435024.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b811a083f0a835ff3e16d1c8310e14c8/kenasogoparitarasirixis.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/xokigas.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v3l6bi8jkd578t76cud3v58fmb/21868593186.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161172f7313f52---sigega.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/42939913737.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/92872972618.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ce23fa7d99693e5909329b786ef9f0f7/68143286255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=are+quit+claim+deeds+legalPDF 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_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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