Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e141ca17acf12ac…

MALICIOUS

PDF

54.0 KB Created: 2021-09-28 17:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d25d1bea27f4a56921575f1fccdcf952 SHA-1: 0e246e44efd3e62ab672fc5b694f8f47ec144b19 SHA-256: 0e141ca17acf12ac422873916e1bb9de3c8371bfd3fed6bc928d4f71956c53d6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also flagged the PDF as malicious with high confidence. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8202

Heuristics 4

  • 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://inwebjor.ru/uplcv?utm_term=download+cake+learn+english PDF link annotation
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/fulujerofivipafedopus.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/vavifizugud.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sujurevajozotitodododosel.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/vugupulosurimovesota.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/49455086635.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16147759d92c08---sofosuvawuva.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/zitowotixikofixodu.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/55875545358.pdfIn PDF document text
    • https://hssanesteban.cl/files/27067332824.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/14370232889.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/jujufasibanamizila.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/bugexenexege.pdfIn PDF document text
    • https://fond.ru/userfiles/file/70993337897.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/75734891167.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/sokajenewijapawej.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/76193531978.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/31324923579.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/24840432231.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/navoxikujesokexaseguzupe.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409024a3322---50576753090.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/12081071657.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613825359a71a---77962262290.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/xumiritadotemivijuwuju.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/55585286978.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_off0000b4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 10728 bytes
SHA-256: aa53c28a749052405dd038c88c1106e69d6792ffeade8f92b6926292cd65e635

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