Malicious PDF — malware analysis report

Static analysis result for SHA-256 7237ec2cf2ba03fd…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 23:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdbad16d90febcf88a7bb76213a10837 SHA-1: 658145ea3398d51af38da46151d76329f4c558ed SHA-256: 7237ec2cf2ba03fda558a2361fa40ae3aab007f034655d3e36923d49545a843b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://fisioterapiasuzzara.it/userfiles/files/21768854941.pdf In PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4edfc9a5703675ae68086b47828cb5c4/16804336267.pdfIn PDF document text
    • http://186086.com/upload/files/bikewomefedeletewenoraliv.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4u8dncstc9ji01djqsl81nog22/xemamewejofobipojaviroli.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/jivikopela.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/menupisegatavapatiwosuwu.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/37895585110.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105120047051513.pdfIn PDF document text
    • http://yuli-china.ru/d/files/2083253211.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1152dd940c435c2a53f77da666eda3f6/gaxitipu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dc541e423a2d43667a47fc35060ac5ca/31216469663.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/91eudu84qlsv0vahuovk9safu6/genusuveza.pdfIn PDF document text
    • https://daismene.it/file/ruvotemubik.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/12671340651.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/96581430690.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/qtd0701nmaio4q9apc87203coe/58768836511.pdfIn PDF document text
    • https://rinducm1.com/contents//files/92004518303.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/4084043381.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20706375f---noxak.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/89561365533.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/2769701034.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/wuxuguwugaj.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fibuziz.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/60890672920.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/xonumimipedevedoz.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/sidikuvexefanivet.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/mukexapurefidovud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=my+toys+worksheets+for+kindergarten+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_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 11016 bytes
SHA-256: 4fa44f137d641717e206db7cae229d72e011e65de3d8eac28f4d96b10709fbcc
font_02_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 19348 bytes
SHA-256: 68597720b052c02eaa6b3ef4defd78a29417baf6f705ecc9d207a3765424b6fc