Malicious PDF — malware analysis report

Static analysis result for SHA-256 432191f4d948e06c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 07:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5c7bb99e3ee07ddeaecd5750d5ec105 SHA-1: f99330e52c70fc817248423d08901ea77c1dab9f SHA-256: 432191f4d948e06cdfe92d1997b458ab5d33eb330a2f837d8c2d968963210799
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users. The document also functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded JavaScript and the link farm structure indicate a multi-stage attack or a lure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://simkoongschool.com/uploads/editer/files/1503468647.pdf In PDF document text
    • http://pokebarslo.com/uploads/files/7419077786.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/ligubobevobivo.pdfIn PDF document text
    • https://777mto.info/contents/files/kanuvetet.pdfIn PDF document text
    • http://twilaw.com/files/files/33597907507.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/37881562864.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/zexodefatup.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140aecbe31b9---50344549914.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/54637780438.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/zulimumoxoba.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b556eaa222---91328852189.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/gadexizeleluwewivik.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/bilulebotawofepifuxat.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/mirokalasifa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161409ad63ae1a---55891611166.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/18137409094.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/pododevoxawemujegix.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/78609837417.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090321455664.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/26774009807.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/fexovawu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420d8fdc258---23195148754.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/60116084793.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/lavuzoxanumizoroniwebeb.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/48347598192.pdfIn PDF document text
    • http://licausi.it/userfiles/files/vabolaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wattage+calculator+pc+buildPDF 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_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 10652 bytes
SHA-256: 14015f55e3b08f190e557704b905a53a6f40728ab7e7d5f00083056127c83e52
font_01_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 17304 bytes
SHA-256: 6a08fb1d9fe338e696f70e32f36233bf1f7ed9bd07d6cb1b4aa7842a863fff3c
font_02_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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