Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2653c693b4185b6…

MALICIOUS

PDF

82.7 KB Created: 2021-08-15 19:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f90590ee9ff653c4d827a80da377206 SHA-1: 60a42b79c8e5b9371f81a253591c395f892ce116 SHA-256: e2653c693b4185b61c245e516fc40ec6cedf31dd3b1cffdb7adc2c0bdc37cea5
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URI heuristics further support its role as a lure for potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161086bee82736---sinuguf.pdf In PDF document text
    • http://szyqjsj.com/UploadFile/file/20210805183123846.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a39b7a82942337a071a1b680a3ba61ee/8481623825.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/dapukubikedesola.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e824c1691f---xuwilapafolubiruzuzutit.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210814084842.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdade1502e---95202987351.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c532ea774b8---ketinisaxafetesa.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/sisalamudegimef.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/42748850817.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160800d50db926---zisanepaki.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b936a799---tovasovupafasoti.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc239246e5---sotad.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/debomubijo.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/5812091873.pdfIn PDF document text
    • http://vanhacollection.com/images/files/21526591241.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9c8dc74c5---kusisilexotagokawugeluw.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1ec9b3e577dcb94607f1679a3e2909eb/33131234643.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/17229617540.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/61bb62da88e87bffa8b84c138522780a/83132003831.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c75a9c18e---fomujifepezejagu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611439ba92379---mugepepakoxufagadafux.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cb83f1d7---sepor.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/27480284383.pdfIn PDF document text
    • https://w4gw.com/file/napejaluse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=heridas+emocionales+bernardo+stamateas+descargar+gratisPDF 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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 19184 bytes
SHA-256: cd50ce5f7fbe250e10322d88e123791460bf395c26c46b2dc3a6ae18fbbe5719
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 10844 bytes
SHA-256: ab861888efaa8de9a3dc89f85551cfe22c4f102744b58c2ff9ff109492748441
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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