Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b394fa1d45d355…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 09:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e358d8c93fdd6b6cdf50f62cb639e86f SHA-1: bae25d562a9cc72b16e47a4630bf447bd2b9b6eb SHA-256: b4b394fa1d45d355f2fe6ea9298bdd123dad8b6c043037192e43f95267ea1f1e
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

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://synerhu.ru/uplcv?utm_term=amsterdam+stories+nescio+pdf PDF link annotation
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fab2b1701e16e54b41066534c28baba5/nujovalofigefovupemunoxe.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c701f58c368---xabufolitufilevijevosuvin.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8d4481176---6852243893.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3aed69d5ec7a5736f52e32f226a152f2/44177322302.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/vazofegixepuse.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/jevoxuwideguzegawegib.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/lojegufefuvugeripalidade.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/tfs0k4qhtqahsqscr53j2opsq4/4797638219.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/17279810439.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2d8673f6---namomuwosomesizixadigun.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/85036248162.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210818_2C5F1272DCCB59F4.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/3018792136.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c7018b37---26748400054.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608298d4c18f1---26230149167.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f687637c4a07677203775445207dd945/44515546824.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160da6e53b8e69---83767881166.pdfIn PDF document text
    • http://toonesk.com/upload/bokira.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/64996ec85b9f5f41e1701764952675ed/givovijujebifarisa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc0fc405d---97602475358.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/fageriludaputixazopo.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/zojijudugiromurigowuzeba.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/levoladafuga.pdfIn PDF document text
    • 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_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 19344 bytes
SHA-256: f2de8ddd6ff058080745d169abb2e575adad693b00c65d242df7216f665270d4