Malicious PDF — malware analysis report

Static analysis result for SHA-256 19321df463afea4b…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 20:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5c10da434026c779728a0a23d4ece511 SHA-1: 568f67c02ad5136615ac157bee802a0732440d79 SHA-256: 19321df463afea4b232b50a0b348f01730ae38f0303a3aa0f613111feb1c3d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/77560601151.pdf In PDF document text
    • http://kyanite.tv/userfiles/file/65868820777.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/43296564768.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/67607729988.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210614162367475419.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/29088460287.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/q1ji71j8lnra7jo604l35uvvl0/xibetunidabejaf.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/2ph0b4d7mp2nc76sqc2fg4fj1g/gimet.pdfIn PDF document text
    • http://laduses.nl/image/file/vefevirexofadasiwe.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/u77ibbs0b0uamd0nloe1opveak/dipanijatutapizogifazupav.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079206dc150a---15818513418.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/587659569e481fe44d465f2e05a2e282/weroxisarafuvifajafa.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/035276d2e77c49453688ace4bcc9c658/78775437190.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/be8a7bfa24e98cdb19a740a7f71c2ec3/79236758204.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/42566253753.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/42164525627.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04fe564417---83979840915.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/64070525897.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3bd49f8c---givuzataxotu.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/vven788hkka8avo7gjfcc6doke/mupumenulik.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/bed6449ee072ca1304420320990873af/borafajexa.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4cq5k8ccnjclt73583qe92ngqt/9375226483.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/jonagopowopedetezusef.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kevosizafitulipajabitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fair+value+of+equity+sharesPDF 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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 17508 bytes
SHA-256: e3ec4d02054f3981f31c29bbe357f9d1765b77133fa6cb0e7e01b05cc0df954d
font_01_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 10608 bytes
SHA-256: 2a5ab925b26b447fc62152fdca5eda08bed47d2a42f893b938c5ecbe22d07cd6
font_02_sfnt_off00013437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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