Malicious PDF — malware analysis report

Static analysis result for SHA-256 394519574c5b80fb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 21:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 101e404e6dbc0e7c334b5d04c433bc0d SHA-1: 857d5638b5b2b7feb9d6b2b401e726c90456ec7e SHA-256: 394519574c5b80fb035d58d887ed8b242390a61437053837a6db48cd3989ba29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.bufolari.com/public/immagini/file/maparajavurexu.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c328b428001---16747414562.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210810051611.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/xedatifowubamak.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/42060718313.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46d873c59---pudawisal.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ag7f7sig1n3ad3bm9omla2pae2/39574828299.pdfIn PDF document text
    • http://prestopc.it/upload/file/3894675363.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vu497hatr5pn9deba735glq3dq/13730279681.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16121bbb88fdfa---30945515977.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/75233123026.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/9bsrv4peigtl7oipehk2mh7gdt/86841540379.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/32277219960.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4vrpeffcgquef2hams1eqvddvd/maxuloletowekanakexewojo.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/kajutuxutoro.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/rugerafekufuxudokumisaver.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/96325ac51526abb1488c78adc31ed88c/giseradelotikuw.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/60933247034.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/rodiwubajudanuwob.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608011ae594c4---zifibumunu.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/rivoludiden.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tovadasiku.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/4914533138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nikon+coolpix+p530+instruction+manualPDF 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_off0000c9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 17132 bytes
SHA-256: bf66e88f71ee8c7da8b39f5329176326cbe41dbef0f57b562cfe2519aa1ef760
font_01_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 11104 bytes
SHA-256: 1ddaad9f3dae46af7aebe153d42c259cb3517b607bf39b3edd16875475d60963
font_02_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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