Malicious PDF — malware analysis report

Static analysis result for SHA-256 98facacf34e7f356…

MALICIOUS

PDF

62.6 KB Created: 2021-06-07 15:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d6bb5874a51253685a0ab5b46dc25a7 SHA-1: fbf1440eca5e96f1ff36f589ae725e4f6127261d SHA-256: 98facacf34e7f356bc27f91bb7a89b002620218fdf2861da0c2a3b6717a6e5f2
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely using spearphishing attachments as the initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8474

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://inwebjor.ru/uplcv?utm_term=libro+de+anatomia+moore+7+edicion+pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ksjnbr2tu2idbp0cv5h993jnk2/4357320232.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ffb2cf6fb8b7cf372dcea3c913dca637/muzejimaratibofasejuxuxe.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf761f0bb---folipumidozuso.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9325b95f504234d864270ec30eb24e89/45259096562.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098513e40ea2---32659535214.pdf
    • http://cheumst.com/upload/fckeditor/file/82777827231.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bdabd0e7---18557222140.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1edb25b32---daxujirawesovogotigiw.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ba3qo9621e18936863j5cs863k/nepuvejigebizigurisaju.pdf
    • https://plentis.eu/ckfinder/userfiles/files/24586155971.pdf
    • https://aartipalette.com/userfiles/file/pemur.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3283d6fe---48338787984.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5k2r9dir9h10u768b9aj2ng9e9/12134456331.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/90a99e345bcdf8e38e27696eb1a1ccd9/43413233622.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/95048dc7202f7b083992f9b1de498a7f/3439615993.pdf
    • https://aradovan.com/userfiles/file/38365591648.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_off0000cc46.bin
23d90d411cc4d8c0fadb1bcecfa5324bafd256332eb57eb5fd2c04b2597d99bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 5252 bytes

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