Malicious PDF — malware analysis report

Static analysis result for SHA-256 4529e59a352ec8ee…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 04:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da16ff5200ce7415e16782234bc8b105 SHA-1: 37274382acbcd8c635809b22b5814d6f2acd169e SHA-256: 4529e59a352ec8ee42db4294da868448f9051bf6bd656dbd9c57dad60a84b726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1f7867966---79244870719.pdf In PDF document text
    • http://inbeeldt.nl/userfiles/file/sajumamemagipotugobibij.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0387f6d44bf2e4b10cad21baad5832da/51664868753.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/98006187198.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/jajimemijefalasumeko.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/8448068368.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/48976787244.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/93730604513.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608727349653f---98317260446.pdfIn PDF document text
    • http://balone.net/_upload/file///42327248605.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/23810052024.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa96f0b68---sonilako.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/63628095399.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f36c6228---moraruwafuzepawaz.pdfIn PDF document text
    • http://laduses.nl/image/file/wobilaziboxusuxo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/788c2f0162e225d34d7fc3fe69f22107/64497845143.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6qmlvmgqn7vkv1lbmhc4nek859/kitip.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/mukatiwovijosikokuj.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e73221a0---96504291329.pdfIn PDF document text
    • https://susta.vn/userfiles/file/65895797858.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e945966b611---gigibigonuzazobifop.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a2dd3da0---diluriruwesojipasumuviper.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/65749014558.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/godunuwofid.pdfIn PDF document text
    • https://haidangpc.com/contents/files/99831668304.pdfIn PDF document text
    • http://artside.org/data/temp/file/68514496698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=integrated+chinese+level+1+part+1+workbook+answer+key+pdfPDF 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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 18332 bytes
SHA-256: 0a41670e513524c2731c98e2820c80314f60564dbf80b1a4460d481382001883
font_02_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 11400 bytes
SHA-256: ecbbf86a60f9aad86d69e926aa445a2ee65403da54c277d604c9d603c4986ade

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