Malicious PDF — malware analysis report

Static analysis result for SHA-256 d653d32ce2f07a9e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 20:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 919b912762f4d0a8351df8abb185d98d SHA-1: fedb8fb6e339fbdfc9959a73f01ccf7fe8290330 SHA-256: d653d32ce2f07a9eaf06d91e25616518af5740ccac6752dc0d81ce77dcf4c657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate the document's primary purpose is to redirect users to potentially harmful external sites, likely for phishing or malware distribution. No scripts were extracted, but the structure and heuristics strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://drafthe.ru/uplcv?utm_term=night+and+the+city+streaming PDF link annotation
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf18f2175---26764097843.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/fabavofum.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/95080368915.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/61811581712.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_35D22E04933600BC.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d97jqj0t3fefa2kfrf37ols045/bajavup.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/jawife.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zujarixumabives.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109051822458848.pdfIn PDF document text
    • http://space-edge.com/upload/files/18840429726.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/jumapufakuzexufoj.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/loxorekezoxeguvagiti.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ij3m38eijmtsm6vej35tiv8b70/58934190149.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/wibemabawenazapok.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/62469069823.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/xesitimeke.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/gupawi.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/xorajuxegipujusewagusuwad.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/fipewezuminifetilawami.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/75101074952.pdfIn 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://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_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 10744 bytes
SHA-256: e88920d30f83c7cb6f7ee3e2b3821f99debb0e2a870433b9061a21d926437c80
font_02_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 19024 bytes
SHA-256: 428193e15d56c831131a530a662914997c3efdf08bb41f762ebeeb2faa099123