Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d365ecd5406e8bd…

MALICIOUS

PDF

81.8 KB Created: 2021-08-19 03:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c789ecaaa5fbc8f772ab1aca4ac00d4b SHA-1: 2fb6c5e9eef86ba9d81fc60345453faaadddd319 SHA-256: 9d365ecd5406e8bdc015d2d35f8ca5e16a4c1a169eff274ebab7e27b4bbe2e63
164 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code, likely leading to a phishing or malware download scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611af8abe63e2---79369486851.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/431ebac0e5a26e1aa0f776d933a880e4/76768292252.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/l99s9o4b6bbh8f7rl4sio8nf2l/76817787606.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15af2053b0ccd0ca80c04ce56931b744/49826780046.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/wexotevemasu.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/kolexudajijiped.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e320a49a80---wenametasemakep.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d02862f25dc---paretapufirozadititaziwez.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/nizutuzijunasoxow.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/80069408257.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/budewixatatiduv.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/87225901011.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/tevebafigaginejotiwovu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae652902cce---85296599927.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929f408f85d---vibitalilowosowodapura.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/23614415120.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/vikena.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43ff3f175---80717337681.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qmkg577592j7d9b79ub9nb9331/46217624051.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/velazesemolavegubijow.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/buzotexapi.pdfIn PDF document text
    • https://dintek.eu/uploads/file/43547612044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=does+a+potato+bun+have+glutenPDF 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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 16796 bytes
SHA-256: 37fefc9b27da2441381c1fb77589738ea8ac8336a0f448218bc3f3fbaf89388f
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 10648 bytes
SHA-256: 7d56a36a6e3a3af9837815d333acee0a7c8515e87410002272cefd01899d5bd0

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