Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c19d0b5475f59b4…

MALICIOUS

PDF

48.0 KB Created: 2021-06-24 04:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ff7315f1257b5a1b21967c9b8421469 SHA-1: f053deadf4e9c6b280cc2429ab41b11198a3332b SHA-256: 4c19d0b5475f59b4d3e03827abf2ee9c6e8626f244580090e41b26bbd1876e1e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9102

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 http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/54kh03movjomreqhvengacgc85/remidewatanewutelatinus.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4c2717d983e9a8e11707b3dc0e425c4f/vobizivavepojedojigasesuv.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d272281c99c---29214682142.pdf
    • http://adabaskimerkezi.com/upload/file/11934949636.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gm43cu1u9u8988j0ht5v5vn1b0/19647829418.pdf
    • https://dienlanhbachkhoa.info/upload/files/61634982625.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u5fhmuq29abdqt638gefoqigu0/rozozugibikiwu.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/tosixubofunifuritefizon.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/dbf955cb409593be4c4e0167f7800e73/tenawewaxuxituxemisukon.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/zusemuwixosifezuji.pdf
    • http://desushibar.com/userfiles/file/vimuvugo.pdf
    • http://petukmahaaaraj.com/userfiles/file/93563300401.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4efcbb5fb8---novuvijogibazatoxuf.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/vepebupolibe.pdf
    • http://shinies.ru/img/lib/file/ronap.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7uq56l1tq5mb68gdduhe6rlvur/88821905237.pdf
    • http://dlmberatung.ch/userfiles/files/80433087318.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=convert+binary+data+to+pdf+file+in+c%2523
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b00d.bin
b8cfbb4afe6ca7138bf1f812eb4e164874c7e2ed43e4aaf5b89cd27284e9d88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB00D 5176 bytes

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