Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad99d518ca9deeb…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 10:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4149377d38de806dbdfc86dacc59d710 SHA-1: 9fc14ef28f2e830d875737ee7205584c14919973 SHA-256: 8ad99d518ca9deeb4120c67acbeb34af9ee9a0dc38c1b088995d97c89fdd0d75
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted from this sample, but the structure suggests it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6474

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=best+free+shooter+games+for+android PDF link annotation
    • https://femagnet.com/upload/edu/article/file/1413962454.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/60228397565.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/0bmnmqqvhjmnle6r2pv8qrh3cb/xalalokativapebu.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/dujetitanevexali.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed40c3111b---sumepojaxoposomilolami.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/24097185819.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/vunakirivojapapafonov.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/mexefozemi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5hd39fm8aepr6v0mjn5gc2qe02/6891816185.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/sagijalozivorekivez.pdfIn PDF document text
    • http://smirna.pl/files/file/98057426388.pdfIn PDF document text
    • http://budropol.de/Upload/file/82779515903.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cc50f2797f24ded98163a0a60237aa5/59906653840.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/wujavopaxijopexesufera.pdfIn PDF document text
    • http://efrex.cz/files/file/sagatewutelanikodu.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/bezemanimepitijuz.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/3361407975.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/408c884e9cc0c3a2dbe951f2114d9217/62924147585.pdfIn PDF document text
    • http://ruihuitax.com/files/file/vodaxe.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/38b0556611f53f2226607d80f112326e/nobomut.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/2877241096.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/90370209283.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/kukugakadogepanukiputoja.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/45258662968.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/63624024713.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 16904 bytes
SHA-256: f929cc23d1c115010b23bf1d53e30c021888947da500b876f449b38290c94311

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