Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb0c5961816a3d6…

MALICIOUS

PDF

79.4 KB Created: 2021-06-14 20:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1f6ac4b26c19f64bd6586b88d61f27cd SHA-1: ebe810ab2b8eb04fb68b79cb7539fbc61ebc1c5a SHA-256: 5cb0c5961816a3d6c6f9b44216a61941bfc13e4148b7ce11838e41b259e9e1ca
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://laborke.ru/uplcv?utm_term=cs+go+start+parameters PDF link annotation
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160991f16388f9---netijazafebirekopadug.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a4216ae2---sogugitonatazepupime.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c14550766---xesuzomaxosawe.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/lixasisosunonokokofawuker.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/47865346426.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/kuraliboz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1992dc276bfd7f2fff1c876fb5921e31/kumani.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27ddb77fac---sumutebeleriw.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3c8c4263---jewifosit.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a661d53a299---30331941258.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9cf50183982712bcccfe60ff0a20b4fa/86247380244.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/35034775771.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608da003cb66c---3245332663.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/bamotakeroxifoxasam.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bapigamixojuzemet.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bugewubila.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c5b37a16879fe0270222c7822b621ab2/vogopufonowowajesaleregoj.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 5012 bytes
SHA-256: 9ffa8bd7afdf759c2362f3cfab74156c214073d70c63a08e1232412526e922fc
font_01_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 11052 bytes
SHA-256: 65594121e50d5ca07232936e8e015ef3868fa089fb742a0863c4aba460c85d8f