Malicious PDF — malware analysis report

Static analysis result for SHA-256 940d765f9e35759a…

MALICIOUS

PDF

72.4 KB Created: 2021-06-23 00:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d70ec61b14afa7280212731b9242cc9c SHA-1: 6cd457d3d7b0990bb1696b846bc235fb1ed60e03 SHA-256: 940d765f9e35759aa1029f63649f4cd8ae0b5277662c963f769a22a71d068078
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs reinforces this assessment. The document body's obfuscated content and the PDF structure itself do not provide further specific indicators of intent beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/66526612050.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/64df1pdkak6kssomnu82klt2cr/92641062148.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/e6kkoaf2h8mj5gljjheefg9lk6/fawerepipobo.pdfIn PDF document text
    • https://tmtteks.com/files/zibelafegenom.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f0e1799a9cb544454cb398fda7f3a549/xexikawadoparizuxe.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7e20c5eb---77501364184.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/nazuvunegonebal.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/vifajoteren.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45e170237---jusodufolutupepemobafi.pdfIn PDF document text
    • http://stromzeleny.cz/file/39689529136.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1338090330609eb82e8624a.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2c6204a570f8e908579ffbcb3e0c63a8/56181282243.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726320112a6---sikid.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3a4330beae97f41fa2e2ba74e65de68e/lojugulijewif.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/wudejupen.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/22bfdc7f323d76bbbc45219ef78ca63b/84028293964.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbf691e2f---bebobofetowate.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dd47e3ad1---44116150839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=full+bass+dj+songPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 5068 bytes
SHA-256: de837005e6a7e2edf4fee5aaa7c245a3452f1a5e6153b3a4ca65f7a47e6e6358
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 10712 bytes
SHA-256: a7b1a0c47eeb5f69eb6a8d481c135e2a62212daaf194d8835ca90de613e89c67