Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49711509a790107…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 16:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9bb2c4b689d2d4ecaa07ecbae808e631 SHA-1: 8f013813e5d0ef0f62fd1b477cf4cf02e81ac535 SHA-256: c49711509a790107d7003928751b72d134ebcf48d1a7460ebfe7cfe52b357885
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL targets point towards a phishing or SEO manipulation scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drivetripper.com/userfiles2020/files/13285697619.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/981e0584907c751b91997b3bb8ac7c2e/5688351245.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p30h1a09er6mlt04m1b42rvq1l/89947338509.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f078fe82609---69642340402.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/32182783311.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/wowodaduxemifebamonepul.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/9530466927.pdfIn PDF document text
    • http://moristas.com/userfiles/files/gugukegefofemapuxibe.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c97ddea6b1c0b45f52648f745fef8816/77742695320.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/11166316228.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/jinokasojude.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/rakodepezamisedopimofamef.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/77872515818.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rmvjn71agm084hkr18fqs3q8p5/63693774194.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/fb013e67e97f36fdc56afce092f8ee26/89485803840.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/sisupuzivamew.pdfIn PDF document text
    • https://path.mn/userfiles/files/libosuzinimulu.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210702131002_cvgzvg.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8258d78f---92250776437.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/fejusudovetuluf.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/60cb4c9da76910dee0b7168e26bd69d7/porewiduxabufesepogepek.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e89df15b25---puwozasonijumabekivovubi.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/zawafexomezomijulijasa.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/ketosiwisugo.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/xabazukemipuseraxib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kinesis+freestyle2+blue+keyboard+manualPDF 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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 19184 bytes
SHA-256: 58e5c9ba13af01ed087ee6a97a76f6bb1059e518b9f671b98d79ed1d8b906539
font_01_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 11072 bytes
SHA-256: fef369c37328bd54d474f1a489838650b920bb85044f2c02463017f424a88eb1