Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae653e02b5a537a…

MALICIOUS

PDF

65.4 KB Created: 2021-09-18 16:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a88bcbe5dd0978ef9470ddca143a6b8 SHA-1: 803c2ee51a6674c2b3cc68128c4fadcf9f7992b1 SHA-256: 4ae653e02b5a537ae4231543b4a4620d7e26dbb4b08ae8b628e7fd26cfb51260
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including a link farm hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8215

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=tom+and+jerry+suicide+episode PDF link annotation
    • http://www.jokilaaksonratsastajat.fi/file/50242998770.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141159a735ad---jijuvarilujumisevixer.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/wevixiluwu.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/mujizuvunisel.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/68682533135.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/16368133806.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/59690711509.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kesamobofu.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/57740898794.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/89843449978.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/negakevajekeropefebe.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/wukisi.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1252cdeb---73222950928.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/rutogapovo.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/87031708432.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/kizosobikasadaxetija.pdfIn PDF document text
    • https://stormester.no/files/file/nifulo.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/13377434946.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0748b6324---53558771793.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/80991274855.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/pakipijipatozijufatume.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/goxux.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/53181659663.pdfIn PDF document text
    • https://pixel.bg/img/file/puvapixikemawofuwekifane.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/jekagunimojekisomipapenal.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 10836 bytes
SHA-256: 62e88f49e175655665d6c0a70ae397bb3cef2bb1dd84953ae3485a05a7aba1d3
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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