Malicious PDF — malware analysis report

Static analysis result for SHA-256 4729cc47289d2373…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 09:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4653a3c690cab6d08b1bc0a90df72e0 SHA-1: 40155b29207d42f3eeed51b6177d8605014d48aa SHA-256: 4729cc47289d2373bed179a59a6db4c7053ff9677cfc829df190b10d8c3edd19
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL distribution are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://etre-belle.su/images/file/kufixukogitulasubatigog.pdf In PDF document text
    • http://chongthamnguoc.vn/img/files/nabokopopiseg.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161369ad196fd4---27401214724.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/bisoxazizusizilun.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9d0c5fba---48097981472.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/3041222677.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/motunibofesituw.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/joxexumo.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/73290114814.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/66045679914.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/5225574320.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec0f9e3ed---miwomosapabi.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/67936269664.pdfIn PDF document text
    • https://il-gusto.com/images/file/nuxaluratuboraladedafisu.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/dukalajokijuvewalikaxaziw.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/49474047244.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/020419548012.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/84409987152.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/relukap.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/46084108358.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de683ec72---20573606828.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/givize.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/24237131860.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/57463399825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=streaming+movie+one+piecePDF 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_off0000b8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B5 15632 bytes
SHA-256: 8934b0d834b12aa8e327beb88f24f76dc17546949a19e0f66120f0e9058e0a0d
font_01_sfnt_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 10644 bytes
SHA-256: 2a6f58f5f2f0f6ce1ae69aaf4a51798c2a696b63d40eda4d3112ce428252bc62
font_02_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1