Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28eea34a2e1a2d0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 23:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 268ae8fff33ccd4fa1719ac8e7b0b542 SHA-1: 65692aea9fe908795604db3fc6bbb9e7ca090281 SHA-256: b28eea34a2e1a2d0602ee8a13e2fdf8827573dd7799d1da920a52cbaa6639a6b
124 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV, indicating it is likely a phishing or malware distribution attempt. Multiple heuristics indicate the PDF functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an effort to obscure the ultimate destination. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=things+to+do+in+minecraft+2020 PDF link annotation
    • https://rougezenekar.hu/files/file/83002423983.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/92360382951.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/niranane.pdfIn PDF document text
    • http://minipit.com/data/files/21727817834.pdfIn PDF document text
    • http://firegallery.ru/img/upload/84607069047.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140c84388227---jibore.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137af643f125---bivap.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/zutanonerozo.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/kumitejunifukula.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/badonubovabeniwotib.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613736bd00376---tamoxekafiwaxak.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/db8b5468a429f78c5a9a866650ee30d2/36004388138.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/89675483273.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/nevox.pdfIn PDF document text
    • https://fishboat.hr/files/fewogidub.pdfIn PDF document text
    • http://insei.eu/userfiles/files/mejoxuwefexexutiwivaf.pdfIn PDF document text
    • https://10fci.org/userfiles/file/dipomuwo.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/wejewavokapedisenevozixo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/nazutakat.pdfIn PDF document text
    • https://turbooto.vn/upload/files/43091663789.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tananedariz.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/bukenujunapedupavowoja.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/13248939422.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/womurofov.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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 17696 bytes
SHA-256: 5afde217b9a729c360d30ce5bd2dcf74287820b9c4be6f6e347963e5003a9ff0
font_01_sfnt_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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