Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8db59fef596ae5b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 08:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a2d90106521963478169cacfb5589af SHA-1: eca2dc448fe120af793f78513a153e299feac289 SHA-256: e8db59fef596ae5b116439dd4518e29e29366e21643763f2151388bc5a87edda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of external URIs and link farm characteristics points towards a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://castilloexterior.es/ckfinder/userfiles/files/82889982422.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f340179ec0---kofofetufimakawabuxi.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48336ab35c---simonuzoxoxuwowoses.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/92923211494.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/aivcukm4fgo6rkfi60nu7rhvkg/31137841246.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/vibokalutufur.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/raq7u4j4nnlpgaers7njvjo1mt/nipixinajunul.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/sukevitexoluzonumopowi.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/49304547093.pdfIn PDF document text
    • https://birudongker.com/contents//files/nevibotorudipudibadarinib.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f334d4311e---jemazujejaputoki.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/2708755566.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775075d532b---72578443259.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/74561869953.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/gopimudejomenasinin.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f9c2a1bb88fdfd798b3d397d2afcfd7c/33565128632.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/95510504208.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/v7fj2dm868rrhtp4cl7vebdeqo/dezedenide.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/9807390670.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04571bb470---31723320499.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/kidizotexuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=java+interview+questions+for+experienced+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 11104 bytes
SHA-256: 199a57606eee959cb92ffb176041f28a633761405801edda0fb22495269a1990
font_02_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 17632 bytes
SHA-256: 3bd60a62bda1ca609083f07d9897cbec58e5afd48f1c63c3b0f974c47adfce8d

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