Malicious PDF — malware analysis report

Static analysis result for SHA-256 6564d0c1da42ec43…

MALICIOUS

PDF

62.5 KB Created: 2021-05-12 19:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3993fb158224f7d67e0bed708d01b21a SHA-1: 0ac3afde033786aed10ed396f38d4a02b40055bd SHA-256: 6564d0c1da42ec43d6ccf49013646ac9151981767fa5bf44b9aa0d265544e08a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ClamAV and ML classifiers, indicating it's a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised WordPress sites, designed to redirect users to potentially harmful content, as suggested by the 'cutest baby videos' lure in one of the URLs. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users via social engineering and drive them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9428

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=cutest+baby+videos
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/1620f62b8f7a5a8fefca077c3960bb95/89464037281.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077154ebf69e---lorosex.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a1790a84f---61215904835.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160784e1e56795---zuvab.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/200d78ddebdeff819b6d0786a69dce08/30655847704.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/dtvpvpgraoob8t00fahd787orf/76108199348.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609682641372b---38375443213.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160824cdb4de41---89298294417.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c952ba9d85---basasadojuverajugidig.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6985cfff0---xegulu.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b28ad55d5---mifufanabuzenunub.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801bddd6fdc---bugegazigogevadelig.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964bb12f8bc---87238650043.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/8ecc05e94e988a8821dda8087508a938/26826897115.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33011d83e---xirejinufugojejutol.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb055195e---vajadibetusapabixez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce96.bin
e231fbdcea180708318ca8d5bd37fc90931507bb0a9cf074aa2d09812648889d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 4896 bytes
font_01_sfnt_off0000df4b.bin
c9ac6ec99d3b485b207817f39e994c310317556184bcfbc9e1232a47a49e8e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 6704 bytes

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