Malicious PDF — malware analysis report

Static analysis result for SHA-256 983e24e8b0c0dff0…

MALICIOUS

PDF

59.9 KB Created: 2021-05-10 23:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8da81d12bab0389d33fd7d631f4c349 SHA-1: 6535cee3cfe2d51d09cff57908f01b9941ad4f62 SHA-256: 983e24e8b0c0dff099f35c121b6c4c21a2a582ce32459504f2e9487a7ea315a5
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9384

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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7c99ae4f67cb1ee8ed6b4c5a526abc2c/75163940658.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8cb1f65d---19476784446.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884f1a7cdfe---94190818526.pdf
    • http://grandinhr.eu/images/user/file/42136370115.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c46e1be76---rotewekazojaz.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/dcc2929c236a4603733bf9ddf58edddb/neravutekuziwejivuduk.pdf
    • https://areicon.com/images/file/kekojejudifuxizemuxudomu.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c25398b3---vuvoraxiwowoluduzasezekav.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8d8555ae---tebigado.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607317714f584---waguk.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092244eb1ae8---90653078366.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ab97d4c4e550a930b381f85174d55fbe/dezedilokebimolefelupumop.pdf
    • https://samarpanbharat.org/trila/userfiles/file/20533521904.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/bagoveresozegetabiberi.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fisiopatologia+del+cancer+de+cuello+uterino+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d476.bin
d5d49a807764148dbc67d6eca26374f7d919483ed4a9ca81873178d4ac8c9a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 1572 bytes
font_01_sfnt_off0000dc79.bin
c6fd4c0f285c663db30b002ca8c302deb8178d94c10838fba09878cdb545ed3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 5276 bytes

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