Malicious PDF — malware analysis report

Static analysis result for SHA-256 97115dc63f35dcdb…

MALICIOUS

PDF

94.3 KB Created: 2021-08-10 02:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 55561d1e24a81992fadf8c693379a3e6 SHA-1: 14cd133a30f502adc24428406fd2eadf2d7fbc1f SHA-256: 97115dc63f35dcdba3703a214c987902517373a78d2ecfaf8bffdf5fdd6c1a82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malware or facilitate phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae283ea1ba---jekegumibokamugolatofijef.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6e60bfc199ec76d7de4815e7fdf9787c/luxefusipekikofetis.pdfIn PDF document text
    • https://everestart.com/images/stories/file/43895358159.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kifiwilaxunuxuxolem.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/20ach4jrlq8mbl5psfq60vhdpo/kowepowexalu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2hpeeufpupiuhl697ac8kbn4c6/12247013055.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5f86793f---joxurawejigomuv.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hur7qjtb3emp48nu7hn6idbmuo/nenazomudenelepekeso.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/newumozufifazo.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/jukulukupi.pdfIn PDF document text
    • https://soechi.com/userfiles/file/80538024835.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/dd5a1ce0a4380ead123011d357643dec/73253701430.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/96615274879.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/dizekasalodemo.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/gugapodarududizujaboni.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6e8fb55d79dee0b9c9e7dc7f9ca24733/bufujizepibevaxenokupiw.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/18977362325.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160988caf95690---25845482668.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/21520760221.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210702111518432.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/1501977882.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f2a8aec0---83197025281.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e1f7fcfd---53904620985.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8806c51ba1---43359278535.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/vaxotezodowakag.pdfIn PDF document text
    • http://rilta.net/userfiles/files/33679905715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bsa+cyber+chip+green+card+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_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 17392 bytes
SHA-256: 2abfb32c718a05b8b5e9e3678139820d9a855c7caa23ed31681a8202bba75708
font_01_sfnt_off000139eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15202 11088 bytes
SHA-256: effb3a858ea3e1c8ed81c7185e6a31f10add6f51b8bdca189ea9db0fa34831db