Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4b043cfff9ac47…

MALICIOUS

PDF

77.4 KB Created: 2021-10-03 20:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af7f72d58b2710719f4cab8bf6b87824 SHA-1: 3f403b29c96b518626cb6e886d4efad546f3fe7b SHA-256: ba4b043cfff9ac474c32d33d9679a33093c0e3f93186669ff71e154dcefe858d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sasmedm.com/www/js/ckfinder/userfiles/files/boxifasukebuwasupugadobi.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615712d8a44ca---15542970082.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/71911182038.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/14329345632.pdfIn PDF document text
    • http://totoumi.jp/upload/file/pofiso.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vch1eo0b5e0rv2notq7g42p5m3/76715131142.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/8034916158.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/97040206215.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/pewofivifalododudozatu.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/jisusasubijepado.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/67381676152.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/95868076454.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/58286594375.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614e02a145c36---zaxazupopokuraf.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/bevaxavurekogoki.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9d6caaf7---wuzuwewit.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/42363839526.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149cd574854f---4006610098.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c73d95ff82---rubaxezizobuwimi.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20211031554248437.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/13872717861.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/kuvowudisevisod.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/88541703511.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1dd62c5ab---warakudobosifef.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/22394098690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=big+brother+nominations+last+nightPDF 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_off0000c0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AA 21136 bytes
SHA-256: c692c57ab399be0e2e0702f5c24693ef3df7ddd96cdc89724834e3ca6c6cfb92
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 10748 bytes
SHA-256: e22fb890ff65e5fd548a24a7fd832cdb16a322ef98e5ba5f426a621cc8ff59f0

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