Malicious PDF — malware analysis report

Static analysis result for SHA-256 b623fdf0f31208e8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 19:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af189aed8bfbe53d41b57121b176536f SHA-1: 313b70d2b88c1ebfc4fdd75524e16db429cee975 SHA-256: b623fdf0f31208e89202d0800462e9d25aaf381fdc0f9ec2355694701b134dbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting further indicates a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb1a7c5a8---vonusexatiwipadota.pdf In PDF document text
    • https://rubenoferro.com/userfiles/file/borarixapabanul.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/piropaxufumenar.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609457f490a0e---83148135187.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/90174005270.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607960164eb80---84420078055.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/rakarafavijifuv.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127eb3891e58---sawogufezofilawogojiziki.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210730_D667991C624A6822.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a848a8b286f---70653481294.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6279d861e---suramutupezekobolewuv.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa55cacdcb---razabodesemagavivutakikib.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/59105863099.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/mafonalizajodokokewi.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/46305100246.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/mixanikukikamopezaj.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e5037420464237eb67fbf22d41680dc3/29880540733.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108040256199463.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/zerofagoxenibarijojir.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118482e1ee2b---jarowefiputi.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/rozepukolobuvozu.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/bokezalupiwupu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/49c2a9ceb22fce0c6508b0195cacf094/maluvojid.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/42200540861.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/7a830e1322f79469dacb6eb42dfbf46a/kosomusebapimirotiwidopub.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737d13ccdfb---55612570588.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/3614059350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=greater+west+town+projectPDF 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_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 17120 bytes
SHA-256: b7c82eaeeba408b501378758f01a7246818ae616d30ad62097c1be965845d588
font_01_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 10484 bytes
SHA-256: cf148aebd9d5edb9705f5b5d33fc8f1d35903e582df342634f92cc2ae425ee0b
font_02_sfnt_off0001277b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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