Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e096551048944d…

MALICIOUS

PDF

71.7 KB Created: 2021-06-09 17:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e6787de1f0f8a35de4a5f9ed9b1424b SHA-1: b7f4cffbf7732987d45581c3fde4c033c8ff7167 SHA-256: 79e096551048944d5e665db2d11f421b516d8c1e0c091be0549aa18857b08ca0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious files. The primary URL, 'https://coretry.ru/uplcv?utm_term=download+music+%2526+audio+mp3', indicates a lure for downloading content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8179

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://coretry.ru/uplcv?utm_term=download+music+%2526+audio+mp3
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e48c7216a---73732215183.pdf
    • https://lacecinella.com/writable/public/userfiles/file/widim.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16c93fb42---gepidadifedad.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077463be0f0f---84248493734.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076003043d47---51067391155.pdf
    • http://csc-028.com/userfiles/file/20210606225635_0sng8j.pdf
    • http://amctop.com/board_data/editor_img/file/202106040648.pdf
    • https://deniz-sogutma.org/img/userfiles/file/97207208179.pdf
    • http://utuin.net/files/fckeditor/file/5987455951.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cdd29c97cee66e641d01125754876512/nizimadifagemotiwo.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae3fcbb9c---44199476064.pdf
    • https://nepalimodelagency.com/userfiles/file/29480620791.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a04f1d6f4a---77180586273.pdf
    • http://unipsyclinic.com/userfiles/file/20210509011225.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9d01c63e---sitevojibom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f52d.bin
c9dc21fe70dd9e8d3df98dfa536e172ecdcb3084abad55bd0da541be576466a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 5080 bytes

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