Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3612e90f1e835f…

MALICIOUS

PDF

78.3 KB Created: 2021-08-10 12:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b817c6ede2228e91aeb7bf099f35023f SHA-1: b93236ae8066bf3d1096cd52b98867f7dda967ef SHA-256: ec3612e90f1e835fff74599d65466c88d6fc88ba045d2c43f318c34dcd369593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of a link farm on disposable hosting and compromised CMS uploads suggests a tactic to obscure the ultimate destination and leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/629cbb83ca5d64ce9e70fb0b1e883efa/gisafaxowuwovosetaduba.pdf In PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/51331225269.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bddb4346a---kozan.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/df4bf46fb84b989426be9f7cac600c70/34688984195.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160913f8481dce---2330158762.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e415e9c137---nopemevez.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/95876987452.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/37929445097.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6a834385dcfd0e3688beaf3e5f9efd96/36163608395.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/5335683986.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd359c7040d---36552070178.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/32055921c2299d56ac5dacf8c29537ba/polevepage.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/judojoborudapapezola.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160de140638bef---saxudavenumog.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607536f3329cc---44626724298.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/felodarut.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/wuvuxazudunijuvibazim.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160abd41117df0---sixadolosaluvujiki.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/wetubidatidujuni.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/reluf.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607783ebaedac---nilenaponavew.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd435b5a5---zuxafepadoxe.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/revona.pdfIn PDF document text
    • https://soechi.net/userfiles/file/zitirowizanoxuxewaw.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fc67cc25297---11824692701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=stihl+fs55r+trimmer+head+partsPDF 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_off0000cecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 10748 bytes
SHA-256: df645df13cd1d995934deab9865e74c78c72b3adff3cb40555fa9cb95f53c545
font_02_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 16848 bytes
SHA-256: 5ec6d14ab7eaaef4cbea724f32baa0d2efd48c178309d8336ddc2963d4526d74

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