Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a6801ba43158f9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 09:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0df71078b96e5b6c91ead20550976127 SHA-1: 559f47fb7fa7b92c6397450f9c882f38b9337a48 SHA-256: 96a6801ba43158f979b85b4d543b6e629f080bca0403ab588ab0dda202c8bb2c
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The presence of a "download button" heuristic suggests a lure to download further malicious content. The ML classifier strongly indicates maliciousness, supporting the attack pattern of a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=how+to+lock+pdf+file+in+android PDF link annotation
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nhh5g0nod03n0adh02piubcg23/kevedobezujeni.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/dibixufopufesagegemub.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e3b2f7e012c76254421f9a4151d7b11a/59730039202.pdfIn PDF document text
    • https://senfina.top/uploads/files/85445488803.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/tumelibolowor.pdfIn PDF document text
    • http://speckrepej.com/upload/file/93017714670.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/15816208807.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/lopopemex.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133584a9cfb9---42189507537.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/vojuzikiwowafokomu.pdfIn PDF document text
    • http://hainfelderteich.at/38905280427.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/13766243030.pdfIn PDF document text
    • http://dmkert.hu/files/file/wobezawopalogofumix.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/8275173252.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa48871ab---39702869516.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/74554567983.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/sesofojowo.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/62368467451.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/36006854403.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/xoniget.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380e50e8cc8---pijoxusipapomo.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/25415426422.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161392fb044d63---483155634.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/db0782de95edf364b57e7059433c596b/1957193458.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/sedebomafamebojokutige.pdfIn PDF document text
    • http://hasyo.net/files/file/romogokimuli.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xotewesof.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_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 17852 bytes
SHA-256: f92a15f21b7b804b045b6f44e7d772783f633f397fa09c2713b4a82ac57dae11
font_02_sfnt_off00012a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 10612 bytes
SHA-256: cf4e2ce6c4787c2cfcde6812cec4d7e6a50934a69a6584e95e5f76646c6c2ed3

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