Malicious PDF — malware analysis report

Static analysis result for SHA-256 b866129db6878182…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 23:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f6f5d33acec702a1715e363ec0f7afc SHA-1: 2b798e5491689972c8020e949862d51d9f8e9045 SHA-256: b866129db6878182e1272f065f31bde4b46337fc5da1d3c1066720b02130904a
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs social engineering to trick users into installing malicious browser extensions or updates. It contains numerous links to potentially compromised websites, many of which host PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cngwalk.com/fckeditor/userfiles/image/ravedetogatogabogurebom.pdf In PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/gujiwerojidedotusosiduju.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/g4dbpcfk0skpiusi3269vgsde2/vebozudexopokum.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f803bbedd4---kowabuboxutajomo.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/kusovebobogovokuzoteguzex.pdfIn PDF document text
    • http://grupophi.es/uploads/files/31942724881.pdfIn PDF document text
    • http://inphilong.com/upload/files/xaneginafalamane.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/lezugojorazovikekega.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390eb7923fc---57032896452.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/36778060063.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/99113347824.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/12508372538.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/18468880323.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/revaziramabufesidumutijop.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/2798626849.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/mufefejuxavigimorepax.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/76610020996.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/13481654067.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf36c4a43e---sovitunemawevet.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/62145549221.pdfIn PDF document text
    • http://emeat.ru/var/files/dinidasisotufifasob.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/86001827458.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wuvozibekigunubagez.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/65859957085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+import+contacts+from+ios+to+androidPDF 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_off0000c0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D8 10680 bytes
SHA-256: d448be643c6ade554c91354d34a981a1b5375a1854f6cd1cfc349415da9237e7
font_01_sfnt_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 15860 bytes
SHA-256: 9123e103a64ea78d0a5b830eda65beba33ec257e223854470da646f6b66fb0dc
font_02_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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