Malicious PDF — malware analysis report

Static analysis result for SHA-256 611f54bd8cbd6567…

MALICIOUS

PDF

81.8 KB Created: 2021-08-18 04:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bef356da4c4a29a85edd732d7c542047 SHA-1: 81f32476e40c93ebe7e87c207b59f312dce8db93 SHA-256: 611f54bd8cbd656780a1e898cb4bd20749d799b4d6af1bed1011f758058cf9fd
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 pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://medvor.ru/uplcv?utm_term=10.s%C4%B1n%C4%B1f+almanca+ders+kitab%C4%B1+cevaplar%C4%B1+ata+yay%C4%B1nc%C4%B1l%C4%B1k+2021 PDF link annotation
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607957f2c1231---71884174465.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/4963179333.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/djfeeabbh1tj1gucol8ohjrfa2/kasusekegab.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3ks2bjiso02fkgvgd1d0dqkuu3/moxukulizupuvebareb.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/46060429638.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/62860393487.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8be038674---79363530196.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ecb07c258e76d74bbff3ece3fb4f2a47/90260559238.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/45099066834.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/56621461907.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/xokafubuzuv.pdfIn PDF document text
    • http://kco.su/userfiles/file/6628264717.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16111da4ac5026---nixiwug.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/5346652633.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fe14276525e07a75d359745ea15c1a7a/wumasudarototewujiji.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/3299298974.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-29/20210529042841973986.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5754ba895---65606997418.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/ritotowitaz.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db45afbfb---vesimazipitirata.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/sivogoke.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/36221530598.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sm4mkfhvrgo1siov00vhdmk5du/zubelokix.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/bumajiridenekufawe.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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 11384 bytes
SHA-256: 430af7a2542ab17e5f79ee009110d42f46a2c7df55fae7d351031f967b643f80
font_02_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 17568 bytes
SHA-256: 76a97ed39b58d4ccadee92c5b93cd2751e0beacd84c35fd8edf9dfb6424da3c9