Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff55fc3d37f25c8…

MALICIOUS

PDF

89.3 KB Created: 2021-07-26 00:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7039b9a02d00f752f44c6e87b7327863 SHA-1: 607d0696862676ac456fc3e8e75d1e982601dcda SHA-256: 9ff55fc3d37f25c83169d5457ab083220a3cae341266c1b227bc25694393493d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2728e3a0079cec3702ac8481e418474b/dibinugikopotulijikibise.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0b9eb6e82152827f7fff1f1f77718627/bibumuvedovewada.pdf
    • http://frigotechreina.com/userfiles/files/29765908104.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f10f1a6f23---fewewepokijodat.pdf
    • http://tainghe.vn/userfiles/file/58714474759.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2de21bf7cdb879718c5aecde0796ccb0/52168237122.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c5c2566c6aaab10cfe15c8a27bddcb9/24669796267.pdf
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/60749810546.pdf
    • http://autoscuolavalerio.it/userfiles/files/98765460961.pdf
    • http://akinmedical.com/uploads/file/82109571440.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e959047f474---12225956502.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d9e5ac8dfd0de287bbd5931486ed1603/11487882922.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/dabulumeketipexo.pdf
    • http://forter.vn/hinhanh/file/63288156906.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbcb7c11367dd25ddb7257bcf11e4518/95390859755.pdf
    • http://phdpecs.hu/userfiles/files/93077300108.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba42996e08---lomujekaj.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/122a8fdf164aa08851d352cc43b4ab10/rawoputamigizej.pdf
    • https://eobliecky.sk/userfiles/file/vojizomed.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c9f168c015f8985ea42b2b5d8aa2a504/29549821712.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8d1367ec---tovusetuposukenirito.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/89e20lcb5tjqf2sls1evinkh8l/bofisom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+adjust+ski+bindings+din
    • 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_off0000fbcf.bin
a829a8cc86c030136507e55ff75bd015bde950de3c1df65706cb189d8ba62f04
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 10684 bytes
font_01_sfnt_off00011438.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 16792 bytes
font_02_sfnt_off00012c4a.bin
ee3bf1de511256e3ba2dbdbe18f162b5b2b9d72cf2a440c87f66fac03051c5c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 16720 bytes