Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65f6f08bc6da99b…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 17:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08e3d90c4990bdb60ea92759e88e6ead SHA-1: 400123f35fb29b0f5dad2168ddfeb822e5754226 SHA-256: f65f6f08bc6da99bfd4b1bba12bbd941f40e0e50cb6609a53c58b44025319472
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, including compromised WordPress upload directories, suggesting an attempt to obscure the final destination or leverage legitimate-looking infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=how+to+get+your+play+store+back PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ac008f07d---xukedafexafidudimanezuz.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/71653364846.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/42684992954.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/kenasunik.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/65925926584.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/41fgckun2iea8rm2rhp11sb5kq/lutetixidazavo.pdfIn PDF document text
    • http://ergakiland.ru/files/files/zerosobenejizupida.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/40953667337.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/mekofixif.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/xekudelemediwofekob.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6svekr4n0jkre8snogft3mj032/fatekagexofenob.pdfIn PDF document text
    • http://webursitet.org/Files/file/8540571319.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/fatipebepakuxosofimikaz.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/jexenokulojil.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/46754896055.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/pawak.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/46501317779.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/felazu.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/nodeteropivax.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/81226077538.pdfIn PDF document text
    • https://isosklo.cz/uploads/30818768167.pdfIn PDF document text
    • https://alibrahimtravel.com/mycms/uploadedimages/editorUploadedImages/file/netapozajil.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/pewegoruzedekawo.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/xakosibitopafozotib.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/97878813009.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_off0000b502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB502 16036 bytes
SHA-256: 2ced242e53ad0f35679442a42f06581cac7fb5a0eafd859ff20b37dbe20bad3b
font_01_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 10876 bytes
SHA-256: 24337413b99c714304e7982991d3d85781362b0f762f0d151c3f8efa3563622e

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