Malicious PDF — malware analysis report

Static analysis result for SHA-256 40402be6b37a68cc…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 04:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2287ca53124bd2c4d7ff90ff1dea3308 SHA-1: 8d5f8b52e027fb2edaf995a04687db49fafb512c SHA-256: 40402be6b37a68cc933bed992e6f80cce533635e226be3d2066b70ef5eebc16a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rgn2u.com/userfiles/files/87681531423.pdf In PDF document text
    • https://mimpiindah1.com/contents/files/8680043300.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-08-11/images/files/11575515783.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/sobibuzud.pdfIn PDF document text
    • https://laser123.com/geektic/files/baredelibuleno.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/ribijuz.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/sexunuvesa.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160729652bfecb---63711020464.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f7cd7204f---7550819424.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/kejajiravixinilojako.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gejatuwa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608441a802d45---42850518018.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd420ac377---28848597003.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/44996646146.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/46434923964.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/99302822427.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d58f29283---33108997036.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/dolanexen.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3b67746c---kumanarute.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/bajilolenevukuxipado.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b7ca4a428dce01dd4c39d9dff259fcfd/vapoxunuser.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/76142575024.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9724bd62---wukala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=feasibility+study+report+on+snail+farming+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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 11172 bytes
SHA-256: 12fe36adceb0551f43ccaf317f8a024b78ccb0ea4dc7f3afa3d699dae774bd1d
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 19764 bytes
SHA-256: 333845ff7248803113e59e969f8d5c1ae5a82077398dd729481c9a111b2db5f0
font_02_sfnt_off000136e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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