Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19b1db9c1d27004…

MALICIOUS

PDF

77.7 KB Created: 2021-10-09 00:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 446b3f01f635dfcb6b1aa757657905e2 SHA-1: 60be7763f737e4a81fed29c09687dfd537831adc SHA-256: f19b1db9c1d270046581aa7335ad18882b9bc37a98de34355bed2ca042582406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://laborke.ru/uplcv?utm_term=kgf+chapter+1+malayalam+download+tamilrockers PDF link annotation
    • http://stressmanagement-karriere.de/userfiles/file/59897039159.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/8006858490.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb40190740---xuvolonefubagimi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7c1578e5d---pupakufexajam.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/lobuxexovomegolajigesabib.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/81fb14adfbb23b9d32009a3f110c6504/kagurutuduxakiwove.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/41422696173.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109180459287253.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/nitizixosutuder.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/51155357432.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/lemulawutifazojorara.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160b473efaaf---mibawikojanozeritumad.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7c882602---62896750417.pdfIn PDF document text
    • http://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/95025375410.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/91753637181.pdfIn PDF document text
    • http://orthodoxnews.us/file/61166149664.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/77513d727d209b24cab08fb45d0820a8/94673853491.pdfIn PDF document text
    • https://udruga-invalida.hr/files/60679092545.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/sikil.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/68343352959.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161510d10d301c---jemexitusekelipegugiz.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_off0000be10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE10 11400 bytes
SHA-256: b73b629a745a445e16408ed6c5a60bf19e5bf3ebb25a3a1b24e56c005646224d
font_01_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 20892 bytes
SHA-256: ba367f5128451d4e6dd5af0a40e08b5dfde818a9f4f1e15b8f1af16fd5f22bf0