Malicious PDF — malware analysis report

Static analysis result for SHA-256 c780dcd0002b5625…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 19:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09e368c94662563393838f2c33dd4c4e SHA-1: 17fc02963e8d7fa3f84c5dca680fca0152679b50 SHA-256: c780dcd0002b5625f7234845bd6af59f46158f6716532ed0d85c3fb97c4f4287
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 a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the nature of the links indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://nomylo.ru/uplcv?utm_term=dave+grohl+led+zeppelin
    • http://volkshilfe-vlbg.at/images/content/files/tuninizi.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0756dd3e---wumakesidovodivo.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722e6da810---ninajusipipevuj.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/bjl43d7tqsckurh96g6h539ks6/24678872697.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a51cfdd5---25974563238.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088182853a25---98220070288.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608380a6c178c---25115773091.pdf
    • http://altinay-law.com/images/file/96945882428.pdf
    • https://juhaszautovill.hu/userfiles/file/37225846064.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/49a0gtehtjnh44bbn5kqqs3e39/90611727573.pdf
    • http://candientuvibra.com/images/file/mamesud.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b22d064e3---zilunudalusu.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff05ebfee---77001797568.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kb14pfd2079qd2s1j70o04sni4/mikugiwiwuxusu.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/effc75221da981b6cebcd7e76b8b7079/tugexerodajejaletofavave.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/71b562b882cb63f2f073eb1fa763c68a/66000039589.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8055e670d7---51487466907.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/98828785020.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/j5b35gghj975qtksqnvn95tiq5/17946952043.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a50136b367---xesikadexurozukixu.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bebf9afb0---84908164637.pdf
    • http://viewcs.com/partner/upload/dextfile/69408393539.pdf
    • https://bselink.com/userfiles/file/kagimulizomof.pdf
    • 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_off0000fce5.bin
52e85deb768e541245bddf87eaaa77619d438b08de9113bebe5ce21b22e697df
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 17644 bytes
font_01_sfnt_off00012ad9.bin
218c6f6abe96963076d71ab4d02e7661230929f7c4bbb39fba3cfa22ef599911
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 10532 bytes
font_02_sfnt_off00014286.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14286 16792 bytes