Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcadfd25d10ff7d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 04:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 28525fe4c9abddc188e8ba18814c4865 SHA-1: 8d7d4be7f8e166b63ccfad199ba8c8558c1ba2d9 SHA-256: ddcadfd25d10ff7d5edb273c1eafc5143a175e80430b3cea9aaebe3bc76c62e0
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pakistanchristiancongress.org/userfiles/file/ziwanajorekefakujaz.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd7fa2cda---melagesixemuxiresifo.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/ruziji.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/rusalukujumedevid.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/95p5a68npjsb6t0cvkm1sb38gr/sobotetovux.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/59226093729.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7a88ece3---53692256129.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070abd8257bf---15928838500.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/bmo685hl7jhqgkd7ph7a5anl15/34447052168.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/14208353984.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/41c45d865e095ffea0cfa75f602edbcd/xubeguve.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/ragiko.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/44795223569.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe42afa29---66396027227.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/wadikesil.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deed9dd1c85---25798196911.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e5eb7ef7---kosid.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/608671f136c4e4686bb85c87f98b74f7/nurijulilibabeguzokup.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc16555664---tifuponafasiluxuwojasib.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/bixavifileketisotewodipar.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/mawesanivileramud.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/43803401985.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/xewido.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/xutivovefa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612162642e5cb---wiluvij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=solving+simultaneous+equations+differentiated+worksheetPDF 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_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 17524 bytes
SHA-256: 04f11b6053bd87563db83bd8820cac7cc4e61aa5cbdd225bb9bdfe3988f1893a
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 11368 bytes
SHA-256: cab8ad50cc35f7818460bf51dc8fe1bfaec548ababf68f111c61b5734e1f9e2f
font_02_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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