Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2d07c2b46d9365…

MALICIOUS

PDF

90.8 KB Created: 2021-09-07 01:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 868973769ea9c670e451ed49c61df172 SHA-1: 499fef8a3b69bc545d2d320958a44cb3441c3aa3 SHA-256: ff2d07c2b46d9365833e974436bddeb0abc76356c538d5d89dd603abef40a127
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a strong intent to distribute or phish via these external resources.

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://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/6279582013.pdf In PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sopatosakar.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_8FDB386D7583A476.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/59084739577.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/porenovaxurifudatoweta.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b981bbb4f05---xazematuwisimifapuwe.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/246ee6ea7c718131f5f74931e35c8277/58700249591.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/forulamoridubozuse.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/misabonukevelolisanu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/fomupav.pdfIn PDF document text
    • http://kechengchem.com/upload/files/67808902753.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/fabefisawif.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609078df891c0---sarotutenupagut.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/4836106269.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/58504047698.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/30689100379.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0506cd76c2---27457277022.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f010f6d8a77---94725928806.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d1390181---29735018094.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210804034123.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93f8d5b0d9---3288921625.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/sivavasumi.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/48870755544.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/jileneb.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/91e728650a034271f43cab01caabd31b/rutoxiwosini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tcp%2Fip+sockets+in+java+pdf+downloadPDF 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_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 10884 bytes
SHA-256: d0babcdf32a02e6fed5b05590b7edf81158fd516e657ffa27ecd248d1088efed
font_01_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 17784 bytes
SHA-256: 5f94d1022b05c0a23465cbf6535e199bbd83f0be3413511ff0ccab1f9954d8b0