Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb52fa8a6a63a7d…

MALICIOUS

PDF

93.0 KB Created: 2021-09-02 14:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd5bf98c5f1519a90d200ab621634889 SHA-1: 3a439f1770522efcb10683f401684ec90999268f SHA-256: beb52fa8a6a63a7d15a4fbda5fb8ef6d5b3f75ae9f4a514f265819da470b8905
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO poisoning or malicious redirection. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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://demkapi.com/resimler/files/pukuxes.pdf In PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/faguxezerimoma.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/it15j8ue6bem5prnof8k8jmh41/lagafosexukegomab.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/46855674135.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086303b99d6e---59625939369.pdfIn PDF document text
    • http://vaynhe.com/upload/files/purikiwajexugidom.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090218531520.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/2300019734.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/sel5q31qlm2r3p23gdcoddne96/baresesiforujedoberezezuv.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/davapanototanabezogo.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/mulemoxosuzemuza.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/benolazefozoniwotefid.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/14909614696.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210630231103.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc2a8e98f6---wajefonolinivul.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/xudopitaripodo.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mrt55oebu3hbi414qb90pjarre/2841546401.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/60021450603.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/zixunexisimizogiviv.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f5bd1b82f---26107802559.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/eacc4984c50071c792643be1787247db/zabamexosolepetonakepiga.pdfIn PDF document text
    • http://jngf.cn/files/file/20121264294.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/lazij.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4fe791e7cb49500f90ece830432182e0/xapuri.pdfIn PDF document text
    • https://sce.tw/uploads/files/60fcb3f952730.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/80632926648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=continuum+hypothesis+proof+pdfPDF 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_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 18952 bytes
SHA-256: e6d23cdfd63b87a4a841a25f7933b63d28976e31daf473e702bb24fdf81c343f
font_01_sfnt_off00013565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 10800 bytes
SHA-256: fc9559a6722b8d7f9f16b82f6928af141e320202aeccff8398ea32b625eae89e
font_02_sfnt_off00014e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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