Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43b74cda73d426b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 21:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4a6b6df52057637ffd25614a14ad705 SHA-1: 3d4d56f2ccaa9d321a6fc0a8032d6c64564382ae SHA-256: c43b74cda73d426b05d467afae2fbdcefeb961e3f30e328a1ee28ad743b35eb1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an intent to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=how+to+transfer+a+ringtone+from+one+phone+to+another PDF link annotation
    • http://ohsongpharm.com/ckfinder/userfiles/files/32116186568.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/5957554241.pdfIn PDF document text
    • https://pecintajp.com/contents/files/59035742487.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/lolefiwin.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/370b4c8f63361f4a2e8c0fbb8e84ee99/83574370001.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tefekanugawi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/l9o9863v48sme3ckkkppouc3cj/62665506462.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910210003536.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d957755d58---23937517861.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/nuxukuwuborapixozax.pdfIn PDF document text
    • https://ghnservizi.com/file/97525409116.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/32386104330.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/15883171483.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/72b75b09fca471787658188a1dcd4f14/linapopilu.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/vuwinodiw.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/86863310172.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/77189491957.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/49299335380.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109171150583980.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/wovefananaza.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c66019366---nanusikasoteritov.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/ziwuz.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/70471544652.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/46432459643.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tutawog.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/49362920431.pdfIn PDF document text
    • 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 16620 bytes
SHA-256: de33281aa03ca3fef420acf2398e3c879a3dd2942cf7e3888ed2283c44dbe840
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 10836 bytes
SHA-256: bc4e98329ec3d6eceb33a3e8bb0beccef6d99c93e50d1d61aafc0fdb947c992d
font_02_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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