Malicious PDF — malware analysis report

Static analysis result for SHA-256 512c3f0d3e447bfb…

MALICIOUS

PDF

126.9 KB Created: 2021-07-03 08:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: accd50a89bd52d5efc0c8a24c6778608 SHA-1: 30217e77b2d02293b238bc1437b625eaf0a20548 SHA-256: 512c3f0d3e447bfbd2ed63679254b4f267ca391d9e098403ef92a21c4a2f5d57
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier strongly indicated maliciousness. The primary purpose appears to be redirecting users through a network of sites, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://irinka.org/ckfinder/userfiles/files/75817298202.pdf In PDF document text
    • http://zdravi-kromeriz.cz/files/file/90237979095.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d0c09874---79846372353.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/14784211470.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a490c02acb9fc103f9d01bfda4997940/vewezakotebuwewipuwoduj.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/139d307e91a2137072af5fbae6b32d40/zubusuvuxufejelegi.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/zomubimezum.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/c790390786c3a80136b766068a4a1b72/wuzutagiza.pdfIn PDF document text
    • https://bataretak.com/img/files/file/busobanukokepapivaj.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/56952909381.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa88d27af---6403676755.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/18b275729cbd32981357371600f833fe/migubisafiwuxigirazawe.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/90891692858.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aaafeee47ee---rotubogobisivorabo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kis0hi7eb9okn3d02t8np73mve/17890784139.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/67129334161.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/52655480265.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/tazarov.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609883641f829---39088266632.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ec500c03eb7e6425b885e9c8a638ee68/segetuzamokipesudiromuja.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc95eb0660c---podepuxati.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/26375032384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=munchausen+by+proxy+victims+in+adulthoodPDF 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_off00018cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A50D 11296 bytes
SHA-256: 0195029ca17bc89eeb3c3de41f5e9e9a57f5e831bdc8c7c42d9184b5d8dd4c47
font_02_sfnt_off0001bf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF39 17900 bytes
SHA-256: 2510d0349dee280ec6e60edb5d8f95bd80d239f7c1065c3f635ed29c0f11832f