Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbdce98bb001f66…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 08:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb41d2968834bbde7f808cc62f177f1a SHA-1: ac3e14d458438f27f22798b4f29ba07919a81ebe SHA-256: 9dbdce98bb001f662e2acf94da0f58007ff036b31e87da8ebd3aa2d608291c9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no executable scripts were extracted, the structure and embedded URLs strongly imply the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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 https://fnb-concepts.com/images/uploads/files/bisenegupijogibubev.pdf In PDF document text
    • https://sskundal.com/userfiles/file/lizajise.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/fupiginadakiline.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xolawitinitanuribimo.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/66720320339.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/64844611984.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210921100752_p1ef6f.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/mutepibixewiruduk.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef7ff39d4---8002533315.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16158b03870ba8---viwebivamezazepupazide.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540d21d394c---39381797655.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/rewejifazajatem.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/84454954524.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/xajasomak.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161442c8d4b320---jumaminasewuxixutobu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/75669a191a2eef3b880d768aaf757dff/95101659583.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/xojobulo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b597d0315d---43639691432.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/2120131146.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/budogesakagugexifaleza.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/pubawekozudu.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/41724534874.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/zonagosowuto.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/34150665781.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/75536278524.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/27703695667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=megan+is+missing+a+true+storyPDF 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_off0000b4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 10612 bytes
SHA-256: 744cd52f9bc80c100da8fe0e459a40803bd148cf999c630f7e6f4b473eb83fc3
font_02_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 17940 bytes
SHA-256: a4085bb78d735e3caa1a807a9a48c5c29436b3b1b0b68efb335579e88d7c0406