Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b66482ec870fda…

MALICIOUS

PDF

81.4 KB Created: 2021-08-08 16:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b463bba97693a9b26ced367a8a80a59b SHA-1: d90425b1f23fc8e2ebd991c31e84231efc21b577 SHA-256: 77b66482ec870fdae2f10eb59764936d1c0a615d6ffdee770bca4f8661ba08c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/fuvipobobofomanewuvuxo.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5b5e55c6b10b853c14b65220a401afaf/22745711436.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/81134845225.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/35409548779.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/67071403733.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/zotajojibugulaga.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/1669059913.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/49777338918.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160985d83e0b39---lumuzarasitu.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/fugezizomirimimugifasove.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/likivalof.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/49310007232.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610384d783e37---gemudurumuge.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/8442451340.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/40864885146.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/vinavibitof.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/jozujapexowagawubi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ijaft1ognqi5li70pf5lbf3ntf/40981846394.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/h3igcansrb3ia9ei7b08fmd305/53460919087.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/49091119219.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda3ed71e0---43905925379.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/79734703780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+many+carbs+in+bojangles+sausage+egg+and+cheese+biscuitPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 11380 bytes
SHA-256: 7ffd23095542a78b278cd97cdb6aa064d3d8c9da7841ba2d1c9e82773951a315
font_01_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 16000 bytes
SHA-256: 965ae9f585dc1d04c4085ed215eb1a9bb2a70aab53541b80e7310b5ae29f8153
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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