Malicious PDF — malware analysis report

Static analysis result for SHA-256 88454c499228afe9…

MALICIOUS

PDF

68.1 KB Created: 2021-05-26 04:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6467914cf8cdc3e3325e009c5649887f SHA-1: 316e2287d0dd0e4caa9f30dc65aaeafe4b79784e SHA-256: 88454c499228afe94d442f9837ea3a18e724c28cf1543df5e66a9f33489549d1
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 ML classifiers, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure related to resetting a Logitech keyboard, intended to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8846

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=how+to+reset+logitech+k750+keyboard
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160850312638c1---ripivarur.pdf
    • http://dynamic1984.com/user_file/file/tevukixerivupa.pdf
    • http://s-privod.ru/userfiles/file/dovamapapelabiwu.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/903d5b4391e4f0c2c51f9088e24091ac/bubof.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef8e3e666---68858253971.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9063b3e4c---71252175362.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ca0da096c---80383934080.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/flhcfc26kpcsk629h8jeqqf2hf/bumaxilatukapebafojipogef.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c0af3422ea7649511abcfe054e678705/80784157839.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/tnbcrbi14qrcj8ks9udcavn2p6/voratesufotofazid.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607271ef3b038---pezosix.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757883c342c---zivozubomuxiwegifudegumi.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/631efc37edf525cce54dd95fc89b360d/jifewogerinafanufawivufog.pdf
    • http://ajtoablakcentrum.com/_user/file/50095918655.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5dapjpg4er24d7bq74c5n9loa6/miwapotowasikoxes.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_off0000dd70.bin
f6d0bf49f0c66339354376623ab01c90231d2cd3a28b7db5153d47bf7927ddcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 5904 bytes
font_01_sfnt_off0000f1a1.bin
883c6f473811a0fd806aa20ae8f3be3bf41748261d9f85320d03aa334151a2df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 11164 bytes

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