Malicious PDF — malware analysis report

Static analysis result for SHA-256 619032c530965beb…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 01:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 130f08beaf022a7edb8d23329757b550 SHA-1: 8224a38a71b7ae0ee3663167dcd78ed9f36f5a92 SHA-256: 619032c530965beb6188d875562d27bea4ce18a387f22f313becf97d6b2d3e10
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent. The file's structure and embedded URLs align with techniques used to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://sxnqx.org/upload/file/Fl202109020458331792.pdf
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/jepodo.pdf
    • http://ydyb.com/filespath/files/20210910135658.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/janegajogagomiw.pdf
    • http://geologicatoscana.eu/userfiles/files/1925588148.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/fefizasuvunasesemugajoma.pdf
    • http://coreaad.com/DreamDataUpload/file/79556640367.pdf
    • http://www.cda.org.hk/ckfinder/userfiles/files/47855094456.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qkc8eg2tk94be8sea8e3799sut/3889828289.pdf
    • http://mylivediamondinventory.com/uploads/files/finuxupidugo.pdf
    • http://philipp-haberland.de/images/upload/file/tojorusudiporajamubizetas.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/36753217126.pdf
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/42238126745.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/92675757222.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/93259323559.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142f8c26294b---3432402972.pdf
    • http://brenno-tojestto.pl/userfiles/file/wizorijasupavufibapubura.pdf
    • http://hostingureitings.lv/uploads/userfiles/files/bawidazakadunanigisukumov.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/uicl6chaltbhheodk9saeq33o5/46582935909.pdf
    • http://racecross.com/upload/edito_fckeditor/file/21023385611.pdf
    • http://stavo-bazar.cz/userfiles/file/fakibeniposolude.pdf
    • http://ekbdrive.ru/ckfinder/userfiles/files/73819654550.pdf
    • https://digireg.at/upload/96525218963.pdf
    • https://mayphotocopydogia.com/upload/files/84513198746.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69651b93148a211dbbeebdc5fe1b4d04/nevagukagi.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614071bdca237---24435786877.pdf
    • https://takipcisec.com/calisma2/files/uploads/60087242092.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=k+words+for+preschool
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1a.bin
31ba173b07d91e7e9cad02185a424470d322c5f2dad01f92609312cc03d97009
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 10340 bytes
font_01_sfnt_off0000e296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 16792 bytes
font_02_sfnt_off0000faa8.bin
83abe2f4fa9e325843fa30de05dd796b20a5402461b17848afc22457d4543623
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 16396 bytes