Malicious PDF — malware analysis report

Static analysis result for SHA-256 6197fb511e9b3234…

MALICIOUS

PDF

93.3 KB Created: 2021-07-14 01:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90c1dd433d1f5be5e00fe3949a91771e SHA-1: f5fa492c05f452849c4b9d7a1171a4aea4fb79b6 SHA-256: 6197fb511e9b323461d8c91397597e86e42aad9fdae29a733c8728fa4010e956
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via a link farm. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc874318682---90639826813.pdf In PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/jijubixodemoposopukot.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160957aac84711---kokeremafag.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/50797174573.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/70007041374.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/lovujoleguvofiboxukozitez.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/89818395157.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/nowasipipesije.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nizokakulutilezisir.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9d886896f623e2ec1dbfc0725a9f71c1/demivizanogilofesolesi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c850f5e065d---ralolifipaj.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/siruvurosatuz.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/40952765575.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7b3445c3d603261dfe79c23bbe6862c2/88482658947.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081abbf3b865---dewasevom.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/nuvidedujotap.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/99357602749.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/22781715459.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/62097664799.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/zidofokezozorike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=anus+itching+due+to+wormsPDF 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_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 10776 bytes
SHA-256: 0c6bcfbf081d6e3625b644fb1bbb67a6c2cffa3dfbbabed3e0620fff1dd0986e
font_01_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD7 17396 bytes
SHA-256: ee07a747c4b16bbd059520e7f71941ed0f6c9d8b3d116491e5697968d41f341c

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