Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2bf09f8c2d1508…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 02:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 350da84ce4d708124cb75961be9ad918 SHA-1: 6c01523a41d68f73536165190846a6f3ffbf0c72 SHA-256: da2bf09f8c2d1508b7336ef3901297df285d79a247ec784ddcf4a55283918236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://clubberia.com/js/ckfinder/userfiles/files/7121832295.pdf In PDF document text
    • http://e-sportis.com/images/upload/jililisokowujefuzaposiwu.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/tevebiri.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc165a307---58221240778.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c36b684ad---sidepemigifikanatezer.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/14421207717.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/21821778383.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5d3c9cbf65c0577678659453008408c0/sepibivibivi.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/latepivogunumafolesun.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/55148277880.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908151324.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210901185836.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fikuvesegikolisunowe.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/zobagezomabizadujovixados.pdfIn PDF document text
    • https://kildevangen.dk/files/nobemuwabizusepu.pdfIn PDF document text
    • http://araratmebel.ru/img/file/bemebumixewodixigetikusaz.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/gasufovuverazuzinetugogod.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/62585966183.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/xisotota.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/radeletufajigemuxisopowef.pdfIn PDF document text
    • http://packturf.fr/files/57305416253.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/78156786160.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/vapenupefimapeke.pdfIn PDF document text
    • http://contelex.it/userfiles/files/48617721319.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109020434446817.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613275f44d5a8---75069147099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=downloading+apps+for+android+phonesPDF 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_off0000ba9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 17056 bytes
SHA-256: 06e9bc672003d81f5194a2459c620999112c434b48c79c54fedf0ced13ff721e
font_02_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 10764 bytes
SHA-256: 17ec3d28a6ffa505bba5a6836589123a10f2b0087519cee34bb87dfb2684d0e0

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