Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f7be9a8f50fefd…

MALICIOUS

PDF

66.5 KB Created: 2021-09-18 22:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c96df1285d47d4cef0c9e30b3c7970c7 SHA-1: da83f5f6711d32bb60bbec6f50ba3d9ad3e1cbe2 SHA-256: b8f7be9a8f50fefd1728b7735722b0852716141cd629a975d5521eab7fd6a44b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

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://pixomot.ru/uplcv?utm_term=fortnite+codes+2020+for+skins PDF link annotation
    • http://thegioimercedes.com/upload/files/367375651.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/83783304092.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/61e12cd3ab9139eafda203ca62cf470d/soxaxodugorapofore.pdfIn PDF document text
    • http://precisao.net/files/files/geluxitum.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/72547558025.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/37549720690.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/mavupukebigi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/24814448948.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/47550969063.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6b5cdce---11995892593.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2d794a6d---fuwonewaxixine.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/17442305271.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/75341596535.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/23687982789.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/43536306405.pdfIn PDF document text
    • http://vtaky.sk/media/file/wepulan.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/domeboverididuvijoko.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdb111ffe---zazidenu.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/89456890214.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/81438232687.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/psvhvn0jvbacqgd6oto0s4smbr/13099628710.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/bumoma.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mufewifukatobedan.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_off0000b0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 18300 bytes
SHA-256: 7f160d63a0c218167ad00644bfd08340b1c5e04835cac6093ad86aeff6dcc5bd
font_01_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 10572 bytes
SHA-256: bfd5fc6e0d557585824cea035139be447afc65c8eb2a738c5872e4a5ea7082e3

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