Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bebf701d4fce026…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 09:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ee321fba8b01133cf7f3731fdc95124 SHA-1: 87b8ebcb0351f1b1375bb261ba25717c7108a0cd SHA-256: 0bebf701d4fce026df792335faa5eee071a2a5bf8183191e91cb8d75844ba03a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised or disposable hosting, suggesting an attempt to lure users to external sites. The embedded URLs, such as http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844801ec58c---76151028673.pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://saatyapi.com/upload/ckfinder/files/13375519975.pdf In PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844801ec58c---76151028673.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202108250424262612.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/visagerugojir.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/95870555046.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/47127289597.pdfIn PDF document text
    • http://ipublicity.cz/data/file/68605158807.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/roxosojidixuvijulisenula.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d119f55ea2---65330848154.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cdd114819---furagesogozelejazusuworab.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1cecc1f1c---kixipujujorajesi.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/13093192399.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/dad1c0ebde23231ca7459c7c87f6f5b4/92438552157.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2225df4c0c914fb354b0a423a8117ac2/guforixi.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/81714207439.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/gonemaza.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/96596449786.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/70821013305.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fatitakaxig.pdfIn PDF document text
    • https://alpinashop.bg/files/87453156243.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/45929415831.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/83888385972.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/50194039638.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/sutovux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=uncle+iroh+soldier+boyPDF 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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 10468 bytes
SHA-256: e8b115a0a31378178c773096c1beb64eab3c77ac08bfb8d7e4045727d2217e59
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 18228 bytes
SHA-256: 20560ba7c2c3f58ab61169347f775a3f80ad9291fee5295a826d0fcfaa2f8f1a
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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