Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d65a18716f731d5…

MALICIOUS

PDF

91.5 KB Created: 2021-09-22 12:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff2f401a2a2e49a922f439d1b630e16e SHA-1: 91630bb7d4c3adad11dadf13d1f1a1eaee9b1054 SHA-256: 4d65a18716f731d50dcfca8b507aae58d9b6f8c07a91548fd7c8dfb7028246e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm strategy. Several URLs point to compromised WordPress upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=dragon+ball+z+vs+naruto+mugen+apk+download PDF link annotation
    • http://vasset.bg/userfiles/file/8953696331.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/luvalirotawedozegof.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/8485439008.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/gurinuxizap.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145badfbad2e---xufepetajiluwazemajuwof.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/56672671779.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/debudibus.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/87993678019.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/81630261644.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/jewiliwom.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132a3e44a512---rebitokonofe.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/jezumamop.pdfIn PDF document text
    • http://computerdoki.hu/user/file/jotukitimuroluvexe.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/vazuxorudanatefarefunif.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/xefar.pdfIn PDF document text
    • http://njchemland.com/upload/files/livufafasokinapefapuj.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/12394403804.pdfIn PDF document text
    • http://kasargod.net/uploads/file/31575196212.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210921_15A1BB7287834289.pdfIn PDF document text
    • http://youil.org/userData/board/file/9211423981.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194a3319f3---11408055152.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/jugekomujizowivokanetefil.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/4312394396.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_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 19332 bytes
SHA-256: 982ee59514fb8b08297984a2f220bc2d5231684b8da3276dc8fba1b63be6935b
font_01_sfnt_off00012dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 11188 bytes
SHA-256: 6117a738aeaa4f4b650acf7354ecc9cc0ef27492123d2a10adf017672bb3ef0f
font_02_sfnt_off000147ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1