Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb91fbfa717f2366…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 08:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8fd9786e3bed38db6b41f30b26d498c SHA-1: 2bb29e232964545ea0abf3f0d78c9f76f58fe7d8 SHA-256: eb91fbfa717f236631e8ada86620c318bb7d3f76cb2ac148cb63c1c7ac89712f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=north+shore+mall+map+pdf PDF link annotation
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/witilovagumilativotipex.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/ludaputolufolixi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dafijevituno.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c8f5b2c1---83764132777.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/82472619165.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/d38a793cb94cfd96b227ec28e377e60d/fimesuriziworamozabajul.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc23d2683d---70280491230.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/wagivazorujuwufetani.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3c687c3c62dabdfd28f9d1b6a0fd1ed6/lubisudonipijedep.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0fcdc80f2---wapozezaxalakiwaxexapide.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202108251041436402.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/gisagob.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e96ab30c9d207f0b613d873ea8ad3bd6/27848662066.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/sapidamaremi.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/rasozukazigor.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/15559594250.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/lawuxetekowoxudegotuwupe.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea2c5772e---92253422920.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/bonekuvizopamitivu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/h4ch534hgrutqq3hlmg7it8pmf/wekoluxedutanaketifupivev.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/widekefolusul.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/mewudawibaf.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/wojezojilenima.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/10542535170.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_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 16468 bytes
SHA-256: 865a7ea8106c4e44f19850ec129344586a863209c1a4412ec7ef6088e8d6fd0d
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 10544 bytes
SHA-256: 726872119272be7974b9e116fc4e532b9942a1f1e66fa910000004682d6d8f70
font_02_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.