Malicious PDF — malware analysis report

Static analysis result for SHA-256 9954f3364d23dbb3…

MALICIOUS

PDF

87.5 KB Created: 2021-09-15 06:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8d442a913943935d08c204a04fae4342 SHA-1: 2caee4f7f4bf9906ef3129d0231c7a9042d94a94 SHA-256: 9954f3364d23dbb3105cc4eeaf8f2aa2936b4e80961a5fe067f3b5c2d74e6e5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The primary attack pattern involves luring the user to click on these links, leading to potential further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://iieng.org/editor/ckfinder/userfiles/files/pebanuzitolaz.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7fbf8f0aff24bd929b53129d60e7cbff/75427057799.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b88992f18---jemalerelebunatonodivaj.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/66011783560.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/55173018353.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/sagivo.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/31258763403.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/ximivonudulose.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/69440569292.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139f2820db---87884591467.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/koputiwume.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/nisofirerikewufimu.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/80530034616.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133de44d40dc---pibasaropuralofa.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/nazalovopatekavulomofu.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/givogidigadov.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/nawawidu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141360a63521---wavoj.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/91467813562.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/56808211645.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/5012029229.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/morikepixumel.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/96699123745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=apa+edition+7+referencesPDF 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_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 19304 bytes
SHA-256: 2a40e8f6ef2b2c3549ee92d0d4da730757da0cf76afd592d0c5e97228cc93246
font_01_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380F 10600 bytes
SHA-256: 6c5e0d3bcfd9f6d8a5b82eacecdc35110104cef0c6c84986630fac5143f973be

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