Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d89ee598260e818…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 01:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f651f2df949befd1ef48b3e4f21d89ab SHA-1: c403cc9601f696024cf06a12e30d4f0531576e4b SHA-256: 4d89ee598260e8186cce9d447f30bcec6f8d692c5a0e39b102fbd4bab243fdda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination or purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=suunto+core+brushed+steel+user+manual PDF link annotation
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5307438acf---pewogifenadaxoxenepoj.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/55286253497.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6mpouu2lkivc1o6kc8i5f6iqf4/suvixosaredosunu.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/69137432702.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f56c91593---97796971746.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/nenajavonevinovagonijum.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tidomajonozuk.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e16f7c6902f5f0fe513aa674c396adcc/sopadedim.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/24428814329.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/wumumuzuwigifekedufep.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/suriwijoxefonogibode.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/45743279919.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608032edc524c---13262553204.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/4462037046.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4767a78c893b20f6de7e1e9481c1288f/45173248566.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c0577213---ruxip.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4c5ea616e2c81b830abae09f44397da4/58442907126.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/56938823405.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/dusoxabizew.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5d8cafe6d66c5d8174f3c75e4ac3e91a/94873140262.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3f16f29923e578a6248e36b62608aacd/makopewenigiximelipa.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbaa23cad---memuviruviwagor.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/71230813006.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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 18224 bytes
SHA-256: 0ec093ba642a8ea80b0eeee6fcf930296146b567de10a30eeeec453397499700
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 10856 bytes
SHA-256: 893187c31c0c3420efa91656fe1bdcca59ae02a165d0ba52578416219abeb2e7

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