Malicious PDF — malware analysis report

Static analysis result for SHA-256 2378f63feb06ab9d…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 12:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28b0b1976b5f22590f898c898635c3ed SHA-1: 25a65ac597e00cdda853b1f1fae292692d7017ae SHA-256: 2378f63feb06ab9dd9405a07da9d785ebeeb122ad6f861407f913dd7573003fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the document contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content. The presence of external URIs and link farms on disposable hosting further supports the attack pattern of luring users to download files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbaa8964c2---semalemidapurawitebeko.pdf In PDF document text
    • http://simonhoirup.dk/userfiles/file/wapavawomupofuno.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607532300cc68---muluvifojapelolasuwawenox.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1ec3d0b49662cc3f408294c4d3824b2e/36476449351.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/ritawafilizoron.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/98663360914.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddb3765fdd---25141689732.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/557ad4b1fc5fccb728051da77c3b9251/26591733898.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7a0d0afda31f8ea2248f2afacb8dc7d0/8980421091.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/85d1cb4a230a637a5a8b735c16d0a617/mabone.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7971b493---jesijozixixi.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/76564000690.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/xazotafed.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f812d4d5d7---futopijusuf.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24f9a9d36---juzero.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af8aaae1295---ropeba.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03287afe9---ginadosunuxelafubosisem.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec145dfe1---27402706702.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/kekefu.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/soloxebo.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/95670346892.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/22830445136.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab15500ce---23546911913.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/ruxilirinelivar.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/96525385730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+snes+romPDF 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_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 10304 bytes
SHA-256: 61741151e1513004b31284479d28fb369eaf0aa4cb646d800f2af3e495280be1
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 17384 bytes
SHA-256: 2e931c913a9ef2a9b0a9ce1a1d3522c6c08c0d23568bf37e8d5f609c5071c91f
font_02_sfnt_off00012f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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