Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd649f18ff35bf33…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 15:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b840dc179cb6d9848c0a79c905b1a8a SHA-1: d9299fcf377cba61597075f890179ec7c03b2017 SHA-256: bd649f18ff35bf33987cf7154bb44b85bc455063a5a5b507ab49edff43ee2a3f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to numerous disposable domains, many of which are hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tzoetemondje.be/uploads/files/geguregilumogigadanin.pdf In PDF document text
    • http://www.oomewatersport.nl/upload/files/vogere.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/naxupofatatidoxetoke.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/marejifed.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161447e3cbdd15---datiragoli.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/67345495676.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/83079539270.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/2989766468.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/21625489488.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/95761094057.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/54628976903.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/46824040323.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/40013b695586354c58a7353b1c4e0872/40881384371.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd7401894---19235091217.pdfIn PDF document text
    • http://unsersohn.ch/images/file/dobilarotodi.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/kovomitevalixuzorupezov.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/93051802369.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/64282902328.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/jologuv.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/84576675251.pdfIn PDF document text
    • http://symbolfoods.com/files/file///liridudisixaketeradimo.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/kobugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=flutter+call+java+codePDF 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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 10272 bytes
SHA-256: 667f34eb1c32bbc29774691fcb07d5673159fc2c15e6805ff1e89f084337d4bc
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 18392 bytes
SHA-256: b08f7bc0225e752bb54bc134c69018deb908cfdcd9cca33890aa5de2975d0832
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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