Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf3eb4dd8ba48d6…

MALICIOUS

PDF

68.1 KB Created: 2021-05-20 11:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c8758dbc3a5fc542417c89bb9b10c8b SHA-1: e9465a82beb4abee8e6b0548d2ce0eb90a33cf64 SHA-256: 1cf3eb4dd8ba48d63dcd7e876ada978d2b4d3cc552874f975e82fe59cc6acf0a
154 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to its creation, and the presence of PDF-specific heuristics further supports its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7936

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://oniceh.ru/uplcv?utm_term=dieta+dukan+vegetariana+pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3449f8ec12---35848288926.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d85b1fb5---91685719639.pdf
    • http://airconbank.com/upload/fckeditor/file/54402993754.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e104ddd6f3---megulepevusidejijekawesov.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/eec866e033f6e9b60e2bd4d5745c3856/85901961179.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c31b1fec0---jijagurazowaw.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084bd566919a---63194431310.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931d4f38d7b---2333581865.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160894e3d4c528---49656229540.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8e59f43b86ef83a0702245ead4035817/19952906158.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3d97e80de535bd021a6cace01c57c4a8/purajano.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48c530599---33991308210.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982dc810f91---wexirage.pdf
    • https://asiarsolutions.com/userfiles/file/63132951619.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfaf.bin
46ee8ff9fd4f4b7e609df0e71f090cbd3a867cae10fe24016bf0227f4d867b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 5124 bytes
font_01_sfnt_off0000f143.bin
8504cd2bd6f5a8c6d100f4844cd236eabed6b76d3e05ee6ff2acdd824633a5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 11228 bytes

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