Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f40985863d55ea6…

MALICIOUS

PDF

96.6 KB Created: 2021-08-06 16:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5c1a4af15481dd4353556b70bc307d3 SHA-1: 37e32e10694db76acb4f62a3fa1b1a91b6a01d47 SHA-256: 2f40985863d55ea6ca4b65070b45ef19ecdcffcfe760c885f9ed0baa512b7128
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect the user to a malicious site via the embedded JavaScript or link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=divisiones+con+punto+decimal+para+ni%C3%B1os+de+quinto+grado PDF link annotation
    • http://bajajsports.com/userfiles/file/kogikujikofipifovid.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/tedizizegojagakesa.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/nixebegusanuwevaniz.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c111dad33c18d9b5ee843e76f9a28441/kexixigaxego.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/99al48ogphboi7blma5u99i7k4/xokipavudujaxawu.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/fejogutezupipigoz.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf67ed9b9b---muvunederujodikonemupo.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09ce23173---74980449890.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/lativupefosuneperokufel.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fobamudinanupawuwiramebu.pdfIn PDF document text
    • https://jetaime-shop.com/files/45712247785.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/74039608800.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4153ebdb0586b5c06d6949bf819f4f08/minesivapunatiris.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/dc948f6b716ae9c5b54af0e7d4fddd9c/jukutolu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/1d9c6ffe69e1760f308e828cdb8844e7/45157056005.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/rulazejijole.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/revemulefub.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/10472516491.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/dosufidafaroxifogi.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/78166446868.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3370012e8---xovazenupesotalisol.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a6baba7e---8974954373.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/nilavirokowikutad.pdfIn PDF document text
    • http://cbstav.cz/file/56692881355.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/34571934774.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/xalomagaw.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6442e5daad---naneponanuduv.pdfIn PDF document text
    • 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_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 18180 bytes
SHA-256: 72083f4f01e3d564a7ae259f3264f9d86e3d7d41f4620022f0cad5a6e9d699d9
font_01_sfnt_off00013e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E82 11376 bytes
SHA-256: b16c9de8795694cd99539add38970aa56040d9c0ac3f356895c16dc24468a8f4
font_02_sfnt_off0001588b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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