Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fd8970e3d7baf1…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 19:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8aa189b813bbe965a7a73a16fb78c35 SHA-1: 7a2a122d0d0569716269835835dae590d1ca76a6 SHA-256: c3fd8970e3d7baf12ebb3a883fa22187904d6f0fce2af092e304710d359e516a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to various domains suggests an attempt to redirect users to malicious content or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://euroroma-bg.org/files/file/46276771317.pdf
    • http://timeyear-v.com/userfiles/file/82582742628.pdf
    • https://akapacha.com/userfiles/file/vaxewikabetajinitulasuxa.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092facdda020---vemusutoleruzepuwuler.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/fefiluzakunosume.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/lisabosapedot.pdf
    • http://devison-matras.com/upload/file/jezim.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/903c4550187e9417720224c879e1f892/ketamezuwapemixewezimuk.pdf
    • https://aduanaldelvalle.com/userfiles/file/bonikutibiwefijigudegi.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4969cf2fde63d567a2809fc9d89417e7/jidolesorubikijepeg.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81bf327f8---52734640638.pdf
    • http://timavoshipsupply.it/userfiles/file/tonapedaku.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2uk89pnhbeir94v60i1vglav22/26641631779.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/fazifofuzitilujisa.pdf
    • https://unosms.us/userfiles/file/77123570862.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddbe1761f---futawo.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/60801204987.pdf
    • http://ottotech.center/userfiles/file/dozafifu.pdf
    • http://aliceinformaticasrl.com/user/pages/wufirefaxagizujuduj.pdf
    • http://primaneighbors.com/userimages/duxuga.pdf
    • http://amandamaitland.com/images/file/bewovumati.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cpp+assessment+answers
    • 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_off0000eb45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 16792 bytes
font_01_sfnt_off00010357.bin
c8935fab76daba0909c8bd32d30bae5b35c7a299df89e23ac3de04ae42ae080d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 17204 bytes
font_02_sfnt_off00012fa5.bin
0de03d030b27a08a863066a83f0f950950a32fd0fe76b857d504f9c6553c683a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 10272 bytes