Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5317e3e32b2cc7…

MALICIOUS

PDF

70.6 KB Created: 2021-06-06 19:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81936e7f3b9c4ac85f14e566e6c00138 SHA-1: 2fcc4230edfffd3cac082de1f0ed1778cc83f3d7 SHA-256: 8b5317e3e32b2cc7c3b47b9480d8e6dff15af2f42cbc66f50b31500885e6b8b0
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely intended to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

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://catamma.ru/uplcv?utm_term=libro+de+lengua+y+literatura+2+bachillerato+resuelto+2019
    • https://ajitcoatings.com/uploads/juwamodulaloronelenagi.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f61ee563---21261947644.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a2402938003---66726945935.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/nmjoeso5ki5ib763gtnil5p24p/19372290624.pdf
    • https://aimhc.com/userfiles/file/28787148828.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/bd19a60f48102bce18ca719dbbcf7de5/18345359000.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba2589c12---84805336011.pdf
    • http://celcg.pl/uploaded/file/nunulilisivojovel.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab30bad5562---20314357714.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/21332435896.pdf
    • http://fine-cottage.ru/userfiles/file/kisixawazibaludoraro.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/78b6e172f776918e7da9bd31b5556c51/76206309342.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3f7b063d---tizenomidifufinerow.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160885573e9f0e---9843721784.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c94ee07f06c0af6bd2951f0199364be/tiregeti.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2891837b0169e6e79798bfc1de274973/lazanepigekomosumuka.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a37d64054ba7bab6615621a9199e2ebd/mizisoverekasesor.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_off0000e955.bin
1987135b7294a562b3cbd1d45c7d6e096c47c53c0ef7e7145716fe8c2a75ecc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 5868 bytes
font_01_sfnt_off0000fd48.bin
cfacc62724d2f2cec9ed05a6771bb3855eb651f7529445a8ccf9b951f5b080b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 11532 bytes

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