Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d5a4c1e4ec76d7…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 03:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f2a9d8bfa7c0bbbc86fe6192907dfef SHA-1: f97ba23df6b53e6fd430ef40ee694f6a0f311c6d SHA-256: b1d5a4c1e4ec76d7b4df9f9d9c0115e194516018ffe4e86a7d1b3a787760b8b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jogamiskolc.hu/ckfinder/userfiles/files/56833235612.pdf In PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/33156484576.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/16441332588.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/vamusezedomefikor.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/pawaxidibaranubixide.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/2092446734.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ce7c774540384b7f6924f0c15f8e87e7/24285686392.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2n37cvatc3203sse3udtn1ep12/37846733842.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ee2e5a06---niwava.pdfIn PDF document text
    • http://meditopthailand.com/file/zizizafapevig.pdfIn PDF document text
    • http://cwesp.biz/upload/file/jatijekoxemiwunonogitano.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/jusiwe.pdfIn PDF document text
    • http://pmke.cz/pictures/files/wupelema.pdfIn PDF document text
    • https://tch.lu/files/files/88186851617.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303f192aabb---dapozazuwutugefukibadimo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb6b90b348---tovaratedumubo.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/88374317740.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/6296207483.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/73028789651.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/98575119.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vusevosodadewatisiko.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/najakedomuvisugapi.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/1171164849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+connect+firestick+to+phone+remotePDF 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_off0000c3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E2 16684 bytes
SHA-256: c999a5e16ede730f8a58c29a6cc8acb2c1ada97ffb1af25ea9a07fd603f227be
font_01_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 10704 bytes
SHA-256: 0685a09f837f5ba6228ef1c9dd01ff7b8ba447615d88143c10171e87b4ceb4a9
font_02_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1