Malicious PDF — malware analysis report

Static analysis result for SHA-256 36675f9512e94083…

MALICIOUS

PDF

91.4 KB Created: 2021-08-26 02:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d047786486e5cc49c5ae86f749ad25d SHA-1: 70e10a77df2edee338345a083153d94e7c44fd54 SHA-256: 36675f9512e9408302e36043500ddda42dba25864da0972efb3db8aec427d3e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristics point towards an attempt to redirect users to malicious content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://wastran.ru/uplcv?utm_term=i+was+made+for+loving+you+tabs PDF link annotation
    • http://tea-ra.com/user_data/upload/save_image/files/biloxidiratijuwofetam.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc58bf5d1.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/dimoke.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/097771b5m1ticoav3hmsa74ml5/gilemenapokalisavuti.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/155c27e6e33a43b91d5fe7f5f0485b59/bogowisatomuda.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/20899959650.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/36166461064.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/1oncr9at4bh5apkn4cr4nrsev4/mosidoziwewonavu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5c3dfc953995fa3d41a2aee347b770a7/mesinopubo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/s07i4i5jgsndokehdup9ljq9vq/povuxepixidetalibuwovabo.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/lonofosiripukilojabu.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/tazimurino.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/59034384500.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ada29e8cfd9---zumewaxakunida.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/pivelik.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/bimewovijudaroj.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/33976963071.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/vorigafojib.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2959472a---ruzedeluvubezunobu.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/37620992375.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/63976286520.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/8976085079.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/64525905136.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/48626639756.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_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 11152 bytes
SHA-256: c093910f45b7a80458e83fd1bf72fdbb114fe3aef2bdbcf8b2c720ea2884e73d
font_01_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 16776 bytes
SHA-256: 9fda07a1e2e5befe8593b5ad1355d4662c737d40dce1712fde0954515d6c91d1
font_02_sfnt_off00014837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1