Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a49733639cd29a…

MALICIOUS

PDF

104.4 KB Created: 2021-08-20 18:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 739b9bd70da3a903f5c00c54027ef792 SHA-1: 835ef2dddb9b5dc5f5ea494ff17afaaffa42ddae SHA-256: 45a49733639cd29a9b093d51d848b2730a19a8768f3a69a725162b0886028985
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating it's part of a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/b5dajklf98kd9vf6tsdbfr53l5/99704603130.pdf
    • http://monkey-do.net/userfiles/file/23131703414.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6353b2af6---dofigaxomigobunapimewi.pdf
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3d54affc12e088a9e4433774a9d10cf/42409032087.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b0f50140---midulogajemukuwuper.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbadfb98f7---pebunobi.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/36f8e2d46ad8d3fbd57dd849e17197f5/75426069704.pdf
    • http://tencanpowder.com/d/files/15820300479.pdf
    • http://sun-tes.ru/files/file/29556993686.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/12d4b7cfe22f2ed8b0cb2d9697a4e0f9/guvarosa.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e53202417---laropotowebosudimupal.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8ea7f6ed26a7b8af7a9fc47cc49b9499/pemokibovanovanadataja.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/adf85ef5b4cf44c08c7e455ec8863a8d/22093845649.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/jbg8embaenujnbqd4a5mvqiubq/wejilavefugolu.pdf
    • http://fapannimario.it/userfiles/files/64269008476.pdf
    • http://gestaocipa.com/public_html/Imagens/file/97564947512.pdf
    • http://willbramephotography.com/rezorovikozu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/109d497ee5247c7f214f09317ef3fa9c/46613353918.pdf
    • http://hk-keber.de/images/file/20360989373.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/117ece0e796cb72f1a4a59fd6e44ed3e/duxegidog.pdf
    • http://clarksville.net/wysiwygfiles/file/50885217751.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b417249014---5465802185.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e42664c9195---siluvomakulataxeb.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/tunurexewadix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+much+do+overseas+basketball+players+make+in+spain
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f3d.bin
c763aeec69e179cd1e3d4b1713b01024d97d0ee004fec7b211470461a9df9182
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 11368 bytes
font_01_sfnt_off000149a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149A9 16792 bytes
font_02_sfnt_off000161bb.bin
019cbd00ea062d030233e026e3b93045c53b49c66e3c121d733ce6d5e1e43164
pdf-font-stream PDF embedded font (sfnt) at offset 0x161BB 18416 bytes