Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cac08ba21452f0d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 14:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 370d0f7dc37c563cf092ed1dde080019 SHA-1: fb4c0dadb76c0311787035ff7037282a74ffef3e SHA-256: 6cac08ba21452f0dc1991dcffa2e20ac9e7ff86d9e48572ec487b478ca7c831f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of JavaScript points to T1059.007. Given the nature of malicious documents, T1566.001 is also applicable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kamwalibais.com/userfiles/file/naxonidi.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ni9aq9mgvdconf7tsnci0dgp90/4875495741.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/79779943427.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b6s2ap8tvc30j1ddulq76mfo2s/sagopurelobivoluxefog.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/91107912248.pdfIn PDF document text
    • http://getdol.com/page_data/file/64289999632.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/girukepokuxipetosi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/71141001983.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/51822174984.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/fulupipesomugusa.pdfIn PDF document text
    • http://nawarashop.com/phya/ckfinder/userfiles/files/pojur.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/zexiwinuzix.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/gixetajiwatiwemavawilenad.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/20578939662.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/6910828967.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308d9f0e312---pudufawamurimupesidoxuma.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9769a5090---zuletowadigozevuresuwagib.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/23202353393.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a899e9887---21756340040.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/35446878579.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/noxuboxetotafikege.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/rikuludubivosolilefilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=free+fire+apk+without+obb+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_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 10820 bytes
SHA-256: 5383e5a76fc04fc1ab72977d43beead037127fe614de18c9e9c427bd01402d8f
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 18548 bytes
SHA-256: 18ff28a5a94d07b5e585fc25f91dec3cfc3738ca556e4d8cbb1e70109a62bc8b
font_02_sfnt_off00013a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1