Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64cc802b4a94527…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 05:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41ea38ccfe4d93bfa8b4635292c7c6b0 SHA-1: 7cae950cd65273f998bf9ea261a8e3b971f96477 SHA-256: b64cc802b4a945278229213d954e2126dc6f8c5d8ac7eb81e575b492db75bfa2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://broadgatecapital.com/userfiles/file/sovexo.pdf In PDF document text
    • http://rund-sro.cz/UserFiles/File/zureguwi.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/90059549576.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/wadufikekevebabek.pdfIn PDF document text
    • http://watch62.ru/files/files/vilixiguzozizug.pdfIn PDF document text
    • https://castel.ro/userfiles/file/90062785861.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/07e0d9e3d826c27bbdf5e5719c48f9f8/baralapubenovu.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/25191008515.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/xuwewomi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365a0c54ce2---piwobenapanerovikimupa.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/xulefekufojixob.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/megadu.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/mikozedijilaziwu.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/ruguzopanenen.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/merusexabew.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/67043787845.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/vokoxegefoxavixat.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3beoc7gb80e3nnqahsdg5f26uf/64438902130.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/63007731190.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/mufawaxipesedoxan.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f9b224cb0---42643640937.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/datapefituzajiraka.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd366a2e1c---98393273252.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e5d6db8fa7f47c38b0c199b2fa628e35/limowiborumazir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+english+patient+pdf+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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 10724 bytes
SHA-256: 3728c8c7044c467dcfdc7837e5acd37148b4bce425614abce52bee700f15b451
font_01_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 17452 bytes
SHA-256: d3b02a262ad07b1f12ccd3e9ef4852c2efd3eb20314ed1e9ec23a2c8048a7a6c
font_02_sfnt_off00011cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1