Malicious PDF — malware analysis report

Static analysis result for SHA-256 3620570bb018805c…

MALICIOUS

PDF

84.2 KB Created: 2021-08-18 01:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3ca4f32ba4f212b319e224a2eed6fea SHA-1: eb0c0c8987de4f174f242037d83ec5fea57a7cc2 SHA-256: 3620570bb018805c6158dc96ecda77b8126b0f6a6ebae4936deba9d9a488937f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ebabd6ca55046e9ceae02b7ef017e7bd/xadedenepopek.pdf In PDF document text
    • https://ksuskalology.com/images/file/zafolidezi.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/98951569356.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7d292790fe197bee1541e34166758645/65550081446.pdfIn PDF document text
    • http://masonhn.com/d/files/1123721378.pdfIn PDF document text
    • http://charontrade.hu/data/file/88742693113.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6129b025---23032841936.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/gifiraniku.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/73e368ca96ef257d57cf71f09a1f0a75/vikodikeronezasedoduro.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/98870058963.pdfIn PDF document text
    • http://elanaclub.ru/userfiles/file/poganabusux.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/du9dn43fa6auimpsct8m4jref2/jajigalepeninezageso.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5f0db6273ee38db64670124b1a8366be/gedajewiligaz.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-9/20210809183356290819.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d932ec31614---janolukudewaku.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/72420135174.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/wotuferisadajazubirul.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69aa782e2d---77057290279.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7699fbfe73---17657109589.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160720a7886506---zerabamefamul.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072514133273499.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/50360115664.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/beladopixixibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+connect+my+lg+soundbar+to+my+vizio+tvPDF 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_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 16668 bytes
SHA-256: b50138ca6d2bcdbe34eaa183682afa76f3c57f8a7ee0762be0da890ba72dafb7
font_01_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 11272 bytes
SHA-256: 91ad7e29b1b4a7d7e355acba7887f79523ce4ad1ed04b1bdc39ac64dacd6dc42
font_02_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1