Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ea1b2f3d58cbdd…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 11:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3964d21b2e220042d352ed6235926d72 SHA-1: 5ac6653a296c7919b8cc3f7b8eea43bf75470276 SHA-256: f4ea1b2f3d58cbdd27c594f0faac78518972f9af5f4640665976695eef5b9ea8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF documents hosted on various websites, some of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and the nature of the hosting suggest a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://suncables.co/images/file/kunuwuxapuxukirupaxemugag.pdf In PDF document text
    • https://millvalley.com/wysiwygfiles/file/31009291742.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/88419f2fc1ecd4ea56c9ce4e6665b2c0/78301732009.pdfIn PDF document text
    • http://360global.ca/userfiles/file/95398940456.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/14325097964.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/vuregujirapomofubi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/998c590294c31254ec9dc89ad8e77993/7709216748.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/sefavarevogudumogi.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/5425430954.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/betago.pdfIn PDF document text
    • http://identik.hu/editor_up/59660791509.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/bewebono.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/nakibafetazewapofete.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/voxetuzupomu.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/lasig.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/zikifufobeg.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062871c3c1---mariruwuleperefisinike.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/tugedafak.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/59860543172.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/kiwojudoperu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/43107589344.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fff3bd27c---53557146758.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ririxajiduruxulanubozos.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/tujovekiluxevafisejara.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210909135454.pdfIn PDF document text
    • http://ranchobg.com/img/file/90168706625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wot+blitz+120+fps+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_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 10844 bytes
SHA-256: a9c5f0dbce3b1247c6d07574e70f402a0dc9f6cc428c0247e21f787adda315f4
font_01_sfnt_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 19676 bytes
SHA-256: fb170777c569a6d7dd95065856f78536c63a0d29829e80015d0e0127dc9f3a00
font_02_sfnt_off0001182c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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