Malicious PDF — malware analysis report

Static analysis result for SHA-256 242c7d10e6fef6cd…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 04:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: affbcf6b311935d5f6271c721f842998 SHA-1: 0601482655a57f45ff6db3215b66cf0231b486a8 SHA-256: 242c7d10e6fef6cd6d5fa6fc4c4b0224309d1f2f8aeef87372111d10f420de5e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=cara+setting+wallpaper+android+full+screen PDF link annotation
    • https://skywaynepal.com/userfiles/file/fezoxi.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/74795648861.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/warugalikipuledam.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16139171ec7a39---petibaninegex.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/39711154972.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/besakasole.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/vojaxovabitera.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/91115920848.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/bomuru.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/98705570390.pdfIn PDF document text
    • http://elpijisystem.com/file/55087855952.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/fizofi.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161301c149fd95---megawudumokuwet.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/tatibidur.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/9915317812.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/89008361448.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/20644995296.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/80021699033.pdfIn PDF document text
    • http://abpaluso.com/upload/file/sulelirigutaguretunagoval.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/rogojavegi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f23gg6ar4s33ouc0g4dp1enn0k/vexozinatabilojenexofif.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-5/20210905230453282118.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/pasokerok.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc86ce6a4---tajedasixinazufese.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/kebesulixevevuzad.pdfIn PDF document text
    • 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_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 18700 bytes
SHA-256: e5ce96b47fe490c876b1ad0dd1a8b86311876a444a7420f521cc410fb43e2500
font_01_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 11012 bytes
SHA-256: aa519bdfc7c043f1c28b5f9c32133ebfe3d097f02a3321242baaedc283750079
font_02_sfnt_off00012eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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