Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d95068e5323865b…

MALICIOUS

PDF

74.9 KB Created: 2021-10-06 01:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4757ec57a9fb294ef2996bee1eace8e SHA-1: f2553cbac814c859c242d14e919f35f7a55787f9 SHA-256: 5d95068e5323865b110ecf50d7e72c0db7a09197822d0e4671827292ca7e3119
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://proficlim.ru/public/userfiles/file/tapupekibovixetox.pdf In PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/nenufifugoxinegopujixuzap.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/69f6e2e335da89d8df299fd3819920c6/32104767735.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/40466409012.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/38054807400.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a6b5630f03563d89ecbfc4040be1248f/lufigugoja.pdfIn PDF document text
    • https://everestart.com/images/stories/file/21318208234.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/82474743860.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/99508189991.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/rirub.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/bigegemanufovi.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/gasofevowilaguwoda.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/pobujovusilitefeme.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161387002c7de2---17276766285.pdfIn PDF document text
    • http://signauction.net/userfiles/file/42342404265.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/takazejopalilaga.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/fuluxemobifelonirameganux.pdfIn PDF document text
    • https://sambelteri.com/contents/files/gokewuzodiwonekal.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/67211509969.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11274371365.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/3314084028.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/nupanomapesalulafimi.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/11448356944.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/70538532401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+long+can+a+male+have+trichomoniasisPDF 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_off0000c17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17B 10820 bytes
SHA-256: 954e2a60d4789ba0f19a727b863261ff0327b4d898a61ba8334109141f007873
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 16604 bytes
SHA-256: 59a0a0f2aac0c00ed45e33137b4d7e80921daae36fd7a91ba73113aaae3108d5
font_02_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1