Malicious PDF — malware analysis report

Static analysis result for SHA-256 e127afbf1d9216ec…

MALICIOUS

PDF

76.3 KB Created: 2021-06-01 12:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 153d670280f5c2be0e675e27f1054c5e SHA-1: bb39c14e3c7958171eb956db08bd95dd159a1455 SHA-256: e127afbf1d9216ec002e502abea74a77657a545baf015cd3fd5d1ef5b61f2c20
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and contains metadata related to PDF generation, but the primary threat appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8759

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://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1155800fbe4c967f08b6f00f5c6feeb6/90015254192.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607254d160875---67265304813.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607193d9671dc---64656929822.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/18ba4e28a7d53b4cd0e03081c7524697/nolimume.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/j605mtbqbreu0ckpr6a8htnp9u/41894331025.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3ebe0a918148b794fec4c5b4745c544d/23534580371.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/f23qbiot6bht0vmn5aou1l3dk2/pesaripasuxekuw.pdf
    • http://texmet.pl/userimages/file/gozemebogo.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gdjmdkmoklpgb8e6l6ppdunarb/kexilub.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/34234410812.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b490ca6e3---98334529997.pdf
    • https://guapa2.com/admin/fck/file/64176859884.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6b23342a8093e5f366f1056ba51a1ade/majizojaxadefapudejowi.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a725822d8f---97572431575.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9c6dd277b45cdfbd52e08b1f2063fe69/pajinabin.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bbb11a2902aff72c0a1fdd243590170b/34753518834.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gta+v+fastest+car+cheat+code
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe4.bin
2e95220a24163a634e2c4d154a6a3548514eda8df09b7a8b1575e62c72bbec50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 5168 bytes
font_01_sfnt_off00010d82.bin
b9c483a843c439d8301046e5fadd52ab721c30163d30f86ac87ab462a64a7a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 11344 bytes

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