Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ab8cdd772ef5f8…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 15:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f169b706c98d71fca049aef4bc39f5ab SHA-1: 25c2b67cf851c16db4a9a232502017b2de2bb791 SHA-256: d6ab8cdd772ef5f8f7a0a3b65689108ca54d6c0c3cd83fb9085907b54baa95fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=cornerstone+anglican+church PDF link annotation
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2eaaa5af---salag.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137428d9da2f---zupomisixiwanubivawerepam.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/falotigiwarovazedilurotal.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/fepeg.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/robesovipuwonuziz.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/5913068431.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/74961367789.pdfIn PDF document text
    • https://irantruck.ir/data/file/javuvimijigogonefojosem.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/53437093491.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wusililazigazarebobojexew.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/5593555681.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f472a26d---19256541639.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/ronalap.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/majazola.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/38434021171.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/46722075358.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/378aa300d2917978ed28d724c2f30d9b/57581032825.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///48786909085.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0984a2fd---80241303939.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/48419850024.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kikusavafujakodazamavo.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/pagazulaxakonata.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_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 17868 bytes
SHA-256: 2d0415e50d9bc2fd8696d79238bf959e1dd5576a752018ff19a6e2598be93694
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 10640 bytes
SHA-256: 40da116ba413843e8df571fceeaf292bc378ca3ab15af4da2af396255506382a