Malicious PDF — malware analysis report

Static analysis result for SHA-256 5847b53a6e420ca5…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 01:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8a6239d03c42feb1f2ca1aaa3acdac9 SHA-1: 5715039895ad9d26caf3522fa7f48793e3c2becf SHA-256: 5847b53a6e420ca5ecf251f698545f90c73772dbeba06723a10257f7425da8f7
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting it's used to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=baixa+idade+media+resumo+pdf PDF link annotation
    • http://aliceinformaticasrl.com/user/pages/tazevaka.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/wovetafa.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/78368403213.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbdb8dcfdb---soleluponibub.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/kesosigixazujefom.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/973f16d68bfeab56da3216ed9bcc9faf/bigil.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fc707b19---34739347105.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa189333a3---34310788586.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/xulonetijekemiro.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/sixatudojusofipor.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/3482185201.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/tazenujuroriduluminefati.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/kosovuxonosavifizupixanu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/77346980172.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160862d406d22c---rimizawugi.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd82a4fcc2---badavatalezap.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758cd39aef6---42449768279.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feaf65a56d7---pizumobep.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7cbd46fb2b676c623c0da50572a8c23f/36826143396.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce52b84a8---lejigodudiragumasu.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/96381373448.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/504d9968b4c845b1568bf48a6f174a94/votodaximudazurigediz.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6fa18ccb2---51549483576.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/91451203146.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2e48199c---68734563506.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_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 19820 bytes
SHA-256: 8f01b5173f6cb97bc43544acd16aff780a09015c49c98b99dd80a9ea7e7c00cc
font_02_sfnt_off00013e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E53 10664 bytes
SHA-256: b2a8c45827426a26222a8fdb9d41de369e2f6a4fde45fd201ea4ffc28aa90877

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