Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89706a2bd55727b…

MALICIOUS

PDF

96.6 KB Created: 2021-08-01 16:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f363dae9c992e7b7157b37bff43f586 SHA-1: 944f8a3a004abca2b92d7dc1048b93c3bf2b9cb4 SHA-256: f89706a2bd55727b95b62412128ff15751e59bddf10b1acb10366ddd9463cd7d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608882cc328ff---65959634221.pdf In PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/05/file/20210605_070433_187.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb05243e9---rotuwifizezil.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/95m3tdprii0t552bffg335o336/jezubosopasidazagujaj.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/lozikirirotavapo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7c49c27b594d0cbf6ebcd6afe4b3e27b/pizodutixadumipuvuzo.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d7d65a7a---vufavugareturezufelesojiw.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/62057985882.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kuziwozisud.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/cd04ba71f9a7cbbbb8f0876a490a952a/vawosozebetotujifavivit.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f010b115a4---88112342356.pdfIn PDF document text
    • http://htwy.com/upload/file/timijozo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5c0bd60e42fc4c8de751f3665f097d09/wemanosemapokoxiwok.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1deb4ccb153939d703a9005ca2257304/33133941152.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/b19mq56lugc3404hsafol1g4p5/lesulukumosasetu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6efa1cc462---pusezonewimexo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/273a8d205f1cf9ad03cbf18d1641bddc/kelumutosadoda.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/zewizazeg.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d54f5e2fbda12c9b370005cc4f89df6e/57806382983.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/notopusofobefemokopixud.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nn6j00hien9ku80eddtd6gq4b7/83031952012.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/zaleminapifona.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/93081a21c91a72110f5d449c02967574/82227215339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=elections+of+1824+worksheet+answersPDF 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_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 11052 bytes
SHA-256: bbba32421f92e5b237a7c2adaa44f65da1fbbbbf64bcd708dd7ea4c12b5cd87c
font_02_sfnt_off000145c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C9 18004 bytes
SHA-256: 40a3cc769d7b277f03f39dcc00cf4547227cd0128384398c4f0cebaa2c35dd1e

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