Malicious PDF — malware analysis report

Static analysis result for SHA-256 b785141ba2be8739…

MALICIOUS

PDF

87.5 KB Created: 2021-06-07 08:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 99af749411b06ae11845e4c200dfefb7 SHA-1: 70f1027a77c3f26413e612eeba4ce7b30c7cc4e1 SHA-256: b785141ba2be87397fc874629174e8266c55661b89555546b89fbeaf2f1ae9fa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external content, potentially for SEO manipulation or to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/uplcv?utm_term=what+is+canonical+correlation PDF link annotation
    • https://cambodiaangkorhomestay.com/userfiles/file/52374408351.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c56016946a808ae4e8ed855012a041c8/84187502037.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/jomutasivitixi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f96d20ad.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/65961811298.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/jorosevafugidopukupagip.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/393005d01427323977ce9fb88177b207/kulegem.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089005db1354---rupejutema.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/74931121822.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/db77910644eec7b749fa63391d2228bd/80878081788.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/74356e1837577a52fb5a8072c9555d6b/pupazasator.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xepinoduloboparal.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h0514kf3acg665an4dad3us5as/79479067154.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fab2b1701e16e54b41066534c28baba5/nujovalofigefovupemunoxe.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/36b14c6b78d119e7b223d39f18f5995d/6167929925.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/65563143479.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 4900 bytes
SHA-256: e7b6be9e70cd4eb9bc76b855df5eebbb206f27038ac24a9e030330db7bcf8dbb
font_01_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 13052 bytes
SHA-256: e525af4a281ecea41656c90c1fe499928dda2799a86c3b36d1778f541da03ce2
font_02_sfnt_off00013bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC3 16084 bytes
SHA-256: 192e1cf8743c95d644f41697cb32af4f2bd92b7888e96aef7f61385a8dcfe722