Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af7ddb8964caef7…

MALICIOUS

PDF

72.3 KB Created: 2021-06-05 23:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a1a6d77c57d7e742ac39e698f7fb9ca SHA-1: 63a6cd31528653220a2275345d0fdbea3573ab7f SHA-256: 0af7ddb8964caef7e7756094c17b279c62b2c2e77f75175051ecfc318901d05b
156 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://philabc.ru/uplcv?utm_term=email+writing+format+formal+and+informal
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fba72b617025d859c481fdfe2ac7e76/99938792692.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607764428381b---vepanigana.pdf
    • http://quick-thailand.com/images/uploads/file/7034320369.pdf
    • https://prtl.pl/userfiles/file/lijetasufilixokut.pdf
    • https://ksboutlet.com/file/files/23416631481.pdf
    • http://studiogiovannone.com/userfiles/files/mozotefanedogejovuwe.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ba2916c5aca1331b8fd0e3b27de40de4/wawunasefijegagovivoranow.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086fb41be853---nidesinotugot.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a21663707c2---71489922578.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad745738f0f---12792569877.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/33d95970b136086776836cb7184d9fd1/80528336522.pdf
    • https://calmoinc.com/upload/editor/file/xepaxudezivolojuki.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d38292acf5---fibugifuguserujas.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f547cc2c---gozemulor.pdf
    • https://autoroman-service.ro/imagini_ws/68214781836.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df64.bin
886a4489e73f849aa91febec589e8d9f22648fd7fb209b1323c127e5987e974d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 5100 bytes
font_01_sfnt_off0000f0b8.bin
6aa594f139c923a56f9919e8c4090aad7e5ab25fd47677e1f4e4bbc900fb7bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 10420 bytes

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