Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e20ffc3dcdcd60…

MALICIOUS

PDF

77.3 KB Created: 2021-08-12 18:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 349ed98a8144c649fa4d008a41855724 SHA-1: 96934ea1b6071bbfd61b4c7925893b728aaff4c1 SHA-256: b1e20ffc3dcdcd604ee7d6a036599a8fc6622c02242b472575d65be2ee8f1468
156 Risk Score

Malware Insights

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

The file is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://szerecsengyogyszertar.hu/editor_up/dugojofalep.pdf In PDF document text
    • http://jkohut.pl/file/17844689889.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/70293ebad3d468900d51b33d8dbc0eef/91871918866.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9jcrs5q5su29tdjeekupnqhden/95312462391.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5e0439a7ac914e5b2c6c3e4b8a38f20f/xuxevo.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/81551459037.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ohmpfuv93ojh7i8mr343vq1su0/bopuligivesavojodil.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/zalumoxuminuz.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/33914772052.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/38b56e202468c755de829a492e49dc55/tanutese.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e3c32355---13311990089.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/4gi8efguqktl0ifoteb64aquak/57331390766.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ailtut3lpcuas8255c4jb8i83d/38880985031.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160756ff61c672---zosimudu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bf690abf---luxekoxobotoxudifusuk.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210619124802933.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/82085325509.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/xeritapitegogobizima.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/67ebd5cd1cfa265455bec4358283f78b/6433522190.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/85491134927.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/21446868419.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/jarizasalisazeje.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fogawupofi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608044e24c200---74808924308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=henle+latin+first+year+answer+key+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_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 16432 bytes
SHA-256: 28d6429198bf14485438e628877068dd2a24dbf1a2fb10e0a0b0e4b67220fff9
font_02_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 10652 bytes
SHA-256: b454d7f657e00c1d5d6393221ad4eb1d37eea868e2d408fd6dbc5becf604d266

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