Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ef2dc2cfb8629a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 09:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 741be18891088f8d176c35ce3a2aa380 SHA-1: 715e74b0fdd3d2238a409792545b6445570456da SHA-256: 96ef2dc2cfb8629a8fd036a636a6c0e8a1ebdd7bccf073474b26a6e3286e52b1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a27fb86108d11beefc7678af6cc46bdb/69772322530.pdf In PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/jabinedebil.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/jepukibezodup.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/44077803426.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/fewitabavedikakitab.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/mijaruwogugezapovuweziso.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/u5q4ap4uetja9geqmdhon26dn9/nugejul.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1a3c3ebee6ed4b77a9166bacd150b955/91402016992.pdfIn PDF document text
    • http://gibisch.com/files/files/rikipofedikazaladezim.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d836b3f69d---5870386950.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbc5260cc7---kaziwajorivumu.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/bigawolilajosiwu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c8f465d7---vefoxedejatusonubi.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/xufaxobuxitemivex.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/duwaribunaner.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/tujaramut.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/lixusitikozuda.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a3c4ec0c40ca6aa53de3c77fed83616d/58123504720.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7ff9cf36b---muzopuwexiw.pdfIn PDF document text
    • http://metall-press.ru/files/18794985903.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f036341d032---71216070186.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/e66a3226f483797dc3cb18d03813e895/46527037462.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c48f261dfda1440f969956d621473d17/51723091601.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/mawabuwemape.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/89965283371.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/76335349472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=meningoencephalitis+pediatrics+pdfPDF 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_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 17056 bytes
SHA-256: 66666a98e21042e77f3005d442e0a6977158e0acb03bccb4b79ea57f455fa9c4
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 10892 bytes
SHA-256: 34cb98de6567869b69b9f1ad97a8110d09bbdb26efa0168e959f66df5c22ade1

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