Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c7bc84fd7120e5…

MALICIOUS

PDF

74.1 KB Created: 2021-06-10 07:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8968bd64888be21524d3649d0e327169 SHA-1: 5d2b1db6177b91af6686ad18ef3b77f7c3fc6d37 SHA-256: 23c7bc84fd7120e531e7f1af6c3dfbdecea52bdb49f61ae27c64fcef72bdeea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple links to external websites, many of which are hosted on compromised WordPress sites. The document's body text, though heavily obfuscated, appears to be a lure related to a quiz, suggesting a phishing or malware distribution attempt. The presence of numerous links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=one+direction+inside+jokes+quiz PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6dbeb82e03910319b6a8a81f6d0d0dfe/voxasigugikubuxa.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/80466698811.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/77fbb302dce5f34b1b6619be3108a2fb/87677770712.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mf60k53o9f32qmr4b1gkqevnj3/27964643715.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/430a3c109b44a505b01628ac9f503b9b/bagoruvupuvuratodosafox.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/014f71e65dbb8128c0ba99faa8d64983/bonimesemimatuwegituzal.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/78792893991.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/81464896857.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/78566154684.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/kirogufawisupoxilole.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/75sc6kpm77kacvik4kklubjc89/762067074.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/bijofegafudimomamorusika.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/346ef00c6431f2ef87f7d9d3e4aac543/rafudofapo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078905f14f55---61131688534.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d13ff84a9894215e9888e9ea38b8c581/38652218618.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2f403068---xamagodomojigutema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000cd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 5036 bytes
SHA-256: a3add77dc4a14144cd11ed2e94395e6da04b2431853475b6f863cd6a2a52cf2c
font_01_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 10976 bytes
SHA-256: 82f5aa724f3b0003392010de7b58e91efd469abef882e1cdcaa8137535c052c0
font_02_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 16632 bytes
SHA-256: 7ed423fd6f64a2accaab24a388a557cab9318e50e2ef4475c53ca1e35efe0f17