Malicious PDF — malware analysis report

Static analysis result for SHA-256 862544be8275b41a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 18:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67dce56afddc267830d4ac96b8863fc8 SHA-1: e6e21a83c63c21237eb81f7ac21d4432725a8d9c SHA-256: 862544be8275b41a4031a6f9d96c4b76a49b1ba042756804ec7deda91a2b31e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=automatic+or+manual+car+philippines PDF link annotation
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a975f9b7---xunolejewifefexelujad.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/wobegawekojaferuja.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76e4f6b9b9---gadokit.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/pisupov.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/47598781535.pdfIn PDF document text
    • http://timebymtm.com/upload/files/wumigibifuvo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/c9c269bb3d27228363fe69c9988c8992/74194831122.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430162828106597.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082626944cb2---13623083467.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/50521968631.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-10/20210810054601941186.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ce877669---jepexegenotewimakaka.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/85128233674.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcedd04c0c---wokovifetiramofaj.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/88616613841.pdfIn PDF document text
    • https://binhvi.com/upload/files/53397714810.pdfIn PDF document text
    • http://status.cz/UserFiles/File/26229247222.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/47356557137.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094415a3f2bb---vidira.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/764fe1322b6e7b223e729dd21cca3d68/72788754897.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jixijeso.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e46a28f89---sibal.pdfIn PDF document text
    • http://101doctor.com/uploads/ckfiles/files/60b482fd95b38.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/samonixepowotoluwovejozez.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_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 10720 bytes
SHA-256: c16c1c81b7efcf9a8bdd352d365bfebdc7f8a58893de3db6dc23c9fb01a664e9
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 16632 bytes
SHA-256: 45261cd8af399909a810e5acd1e55642f83089c8a3edae50c186bcdff0087596
font_02_sfnt_off00012fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1