Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c1960ccd8054f5…

MALICIOUS

PDF

61.1 KB Created: 2021-05-16 19:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a04b614aa5959d3aa2e51fdf39d764b0 SHA-1: 2d9afc7e2d1c5b7ee6c9733e21c1a6c081b9b282 SHA-256: d4c1960ccd8054f5a24efcd8afcb893ad8092d5be93e7a8ef420d476ada97182
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8741

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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/190954ed177d56c8692a6cc550d55068/difafewixotosul.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a0e8d865---lusajisumuxowaboxevavuzaz.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94ac781e7---wagewisorovetul.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff87af87a---fojawitiwuseduf.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j1ssrluak529ohjdujl83aidoe/90905352048.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/35cc8e7e03a9fcef35f47e21d6169821/62461208360.pdf
    • http://alemotta.com/resources/original/file/93911295078.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160960089210f8---tukasubifex.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b68d7c6b2c9d2c09f81d50d2df0a0083/demirefowijow.pdf
    • http://www.sport-konyv.hu/userfiles/file/verejuwaguzifanisubo.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/be483c8edbf02737cac1b0b9389fcb27/dusewarifetoz.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebed8236da---xapapojuwolez.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1f660912454662ec300eb363629cd9e5/xuzisafixekagepexo.pdf
    • https://ebooksweb.net/files/file/53849341781.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0849a64d1110923ed280e84ca7481aa2/36600908204.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160759ffd50574---xerowemogederafarafajinim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bobby+east+2019+songs
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2d.bin
151df32a72fda943e74eeebae5215cff3083fd1586bef45e8353967f5ebf2986		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 5496 bytes
font_01_sfnt_off0000ee04.bin
a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 2140 bytes

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