Malicious PDF — malware analysis report

Static analysis result for SHA-256 907776e9e894160b…

MALICIOUS

PDF

248.0 KB Created: 2021-07-27 19:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cace2cbe50f6f4c3e3ec7c04cd1b64e5 SHA-1: 72cc9dea01cb5039efd72c6c3d16bd56b03bfb49 SHA-256: 907776e9e894160be419bf3730f9687df44b38831000c2d149145a8bb2715d13
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to a malicious download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/sifupunavin.pdf In PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c5014c6778b4501672bcb5990d6ef85e/wiwumijanoxiwitonebepoke.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/mison.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8be37970170f64a790a7a674452d5ace/kasolizanijepozifiwo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc14d286c07---jusigezegejagosuru.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/44229235470.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/e1d3kj396j2cg7s3vav2r3ohb0/piwab.pdfIn PDF document text
    • http://fitviewer.de/files/file/19608294497.pdfIn PDF document text
    • http://bptramptour.pl/files/file/pitukunug.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988e52a0d1d---18293195894.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/pikupubad.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/mexisebomaxivurelazuzo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b269a4378a---62498988925.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ffb2dd117ecd6bb566f2ff39fe93cb68/zazasirigikawowe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kbprrpc12rt325jnt2cato6r66/nolirupipunufiwuxijejo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/niwunuloruwu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9292f733---83199964696.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/jabofibes.pdfIn PDF document text
    • https://wagaskar.com/media/98349793165.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/mexijofelapi.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/k55gakk50bidtsd609mcs026d4/29115006256.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0185eaf0445980b78966e159868630a9/99569239661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=physical+pharmacy+book+pdf+downloadPDF 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_off00036b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36B06 11088 bytes
SHA-256: 1f5b270b121c5acc74bc33a3ea14c0ecda475014fcf1c24f1f1c6fcae89fcbdd
font_01_sfnt_off00038482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38482 19316 bytes
SHA-256: fe06e88f5483db47954d349499f1a8794c07ed1a20ebb9e73c6e024109ac7456
font_02_sfnt_off0003b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1