Malicious PDF — malware analysis report

Static analysis result for SHA-256 7277838bedfc7f71…

MALICIOUS

PDF

72.2 KB Created: 2021-09-22 14:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b42327095189bb75e37120c8e1f0da2b SHA-1: 453c4746109fde49d875c4bb47660a9e05b75e25 SHA-256: 7277838bedfc7f71bdc29362626e3b0513792944308ea25ae9ba1d9b6ea44ce1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://archism.ru/uplcv?utm_term=c+sharp+programming+language+pdf PDF link annotation
    • http://bangtaisay.com/uploads/userfiles/file/26508007514.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/tenoloxulazepurabafewu.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/wumemibodudifinetu.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/28177611166.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/75580799154.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/53240688010.pdfIn PDF document text
    • http://kezmosas.hu/files/file/47110854305.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/sivosakaxubajowuz.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/penimajuworedeluporonax.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/sededukusibewitonaruwoput.pdfIn PDF document text
    • https://temahr.hr/files/65551922716.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/626529383.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7e2f0cff---paximosiwapamep.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/35771951250.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/88879871523.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/71065197465.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58523c8a6---72661259526.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090602480991.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41eb76199---22626281806.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/loziz.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/38809798844.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58eea2bfa---16430670565.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/zufuwe.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/nutadisijumiwo.pdfIn PDF document text
    • 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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 16668 bytes
SHA-256: 9fdec866491da30145350c8e190ea4bd2a5566b117b6b5eda6acc8337b95e0e4
font_01_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10980 bytes
SHA-256: 1ee4d6b998b17cbeee1d3c3edda95e55e0fe3519233ba9eb28d3a00088258766

Open this report in the interactive analyzer, or submit your own file for analysis.