Malicious PDF — malware analysis report

Static analysis result for SHA-256 799c0f04a57b09f4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 12:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f0e7d851861724417b892092fb2fd92 SHA-1: c17c6aeafbaacf59b648ecc571cc43e2baa03a9a SHA-256: 799c0f04a57b09f44d3577af8dc532d5b709b7416375a2d78b7818ec42e5f15c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs point to various domains, many of which appear to be compromised WordPress installations, suggesting a tactic to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://shriramsteels.in/public/ckfinder/userfiles/files/makesujevorivelewis.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094758399784---genifatuzanekanaj.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3a8b7c32a3f735b300714fa8ca303b93/4744496082.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b24b46ad0a8603691ce8fc65b9e7e9fc/77101049550.pdfIn PDF document text
    • http://moristas.com/userfiles/files/wiruga.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/fadifob.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090222155582.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aad7bca3662---3554905737.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/4652239890.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070317082729.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/63511725868.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/tivixakaxemazigebajat.pdfIn PDF document text
    • http://dgjst.com/upfile/file/37181836483.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/wovimidoxowosumipiwiz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f4u5olf7ca7c32p2hpoeesid06/85622642499.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ecac8b16504---74225756084.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e15bfa88---94429472448.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/wegedepimebavener.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/61100975885.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/14gq0qo5t2dl1fpjv7sf1mvsf6/korozomasesesodot.pdfIn PDF document text
    • https://people11people.gr/uploads/File/texozivozosozofot.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5646190d07e56d4a398c65b2bdc64558/11422750713.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cdca680699ba1852fcf500057e453b59/22980885328.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5f23370ff4676d1ca585bd91bed775d6/64449448966.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f269d9e9---84203527058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=drip+irrigation+system+ppt+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 10908 bytes
SHA-256: 633b65abb7b5a570b04bb8691538f3c7d582a25a81fc7fc12cc4a13ac6084296
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 16716 bytes
SHA-256: 4fc6c5fee85eda8f7db988785b7d95ea1dae5a7ab7109692ab8c07ae0fd2a1a3
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1