Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb8a70e30d43740…

MALICIOUS

PDF

73.2 KB Created: 2021-07-07 03:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddec8ef78ead955ce963641ac41b5aff SHA-1: 4ab623d6f7f65f22e89528f453c85e6dbbcf3f42 SHA-256: dbb8a70e30d4374009caaeca5e85681c4a0fc39d63ad1850b68a1e00d35000fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into visiting these sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=solving+quadratic+inequalities+worksheet+with+answers
    • http://nakatka.com/files/file/2080881822.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d56qikc4lte5v52pjl4ngcjgu1/62368958041.pdf
    • http://emurus.jp/userfiles/file/27269247673.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ecf657807---41665037880.pdf
    • https://kermanrooz.com/img/files/foguko.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/478da097a8171162d81e6754e650f830/27912496719.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/rodemegumunutiwifasoxepa.pdf
    • http://originalcheck.it/public/img_admin/file///zabedex.pdf
    • https://netpage.info/userfiles/file/xokisisiniwofu.pdf
    • http://mawaevents.com/uploads/file/17243424126.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aae51f5f895---78642693055.pdf
    • http://pantryscan.com/123cars/imagefck/file/911140205.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c235dd89b1b---99457096263.pdf
    • https://landbondcorten.com/attachment/file/15942779d602bf440ee3bc2ab7bc95c2.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0e8b53f2d77a2ba6fdc48e8b8d14ec3d/finoru.pdf
    • http://vieclamquantri.net/upload/files/99136634633.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079309f6ba7c---naxeta.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071e15b931a1---wokevaruxokuzelunav.pdf
    • http://massvt.sk/editor_uploads/system/files/bemagigorerofug.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1d07aac2---66651316389.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16082df1c81551---76603381056.pdf
    • http://kaupa.cz/userfiles/file/zutiripubasevipe.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/70d35fdc7e0949217625263abbdd6bd9/53604541503.pdf
    • https://travelworld.ro/userfiles/file/kuxoluduvebivopuwunarodak.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_off0000bba7.bin
675326ca022c6827204b9b89fbbddef9fa7303d8ffee747f6cc1ad4d73cdc363
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA7 11212 bytes
font_01_sfnt_off0000d562.bin
6d387b257a71b95fb3eaad4b51ced5b62beec1c3f4dad77292f2d69c93486444
pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 16076 bytes
font_02_sfnt_off0000fefb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 16792 bytes