Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a24be8aed08190…

MALICIOUS

PDF

98.8 KB Created: 2021-07-22 17:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cf941f69c8d9929f44ad0a5f50295b57 SHA-1: 896b46114eb91d6b869b3a18ca2852dfc4902703 SHA-256: 14a24be8aed081904981da642001eaa0cf1e3f80fc1a1c4d93f6d545917091ed
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or phishing by directing users to malicious content. No scripts were extracted, and the document body was unreadable, but the URL analysis is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://newbusan.net/FileData/ckfinder/files/20210624_24A53186A03DDB09.pdf In PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/32383930476.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/4489145964.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8db84670a4b9ae87f691976a60f50e71/91139188352.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1112be61b1---1415184981.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b8c4d09e35c468bd9c7c92a6bec89fa/lozubemulinafirepasaridod.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9934ce4183---zisiresolip.pdfIn PDF document text
    • https://led7.ru/file/46903277035.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/datovofemanonojudofo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/s6nq55ndt2u90k60q5e9nu8ha4/kujopekifevewasuto.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/69159112573.pdfIn PDF document text
    • https://ptogel2.com/contents//files/86987641546.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/pulopofojun.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/jixisijuxi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e20e3a5d---70485178379.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa46c3b595---60264978796.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8c5b7f5047a8a562e610c673d832491e/40398331606.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/eq8r2vaoft2ujmckc5hsj9udi1/vipoxo.pdfIn PDF document text
    • http://poorclarescork.ie/images/43166082541.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/5263617930.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/vonamorajoraf.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8avsimh5ssoqp4fu96fmrm4gs2/93638429749.pdfIn PDF document text
    • http://yilip.net/userData/board/file/dusosikipawora.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/97f2e15fc8ff626cd9f03922d8e1e389/9853884038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=royale+high+apartment+music+codesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 18160 bytes
SHA-256: 21143fd0ffa3235bf3bd55754f23b02b4c6133646cc503d6a3d22c4a129497c3
font_01_sfnt_off00014004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14004 11220 bytes
SHA-256: a9ade7b30c9406379b0146e31dd8eef573eff3b39c15447f3ac7ed3cda594180
font_02_sfnt_off000159f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17204 2116 bytes
SHA-256: 914cb98cf763eb5bf60cd0b954b32dad28a5c3dc46e3af71210845b182396e06