Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c655e196695b45…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 17:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b41909621a82de6570d34c98aaa8bd91 SHA-1: 6901b114a70506b2c37b8fd1e409b7c13121f9d3 SHA-256: b3c655e196695b451aaee9a82f5bb1b99ec6a55f91a103a103918d4c54019793
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, strongly suggests an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4aaf923c1---2169496735.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d3f2a4a8775565d791c021d24ddfcdde/jabulorewavupa.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/xelavufufitewimonoxi.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210809184441.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/36ee4a2e978abd5c33d490b5652b9bd3/tofubo.pdfIn PDF document text
    • https://blogsma.com/files/90755232171.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fe37784e2---verekiwatufadofukage.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/58457743150.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5142c852d1---xuxudo.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/zopurogaxagixigukivun.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/38652083643.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7a75ff24baee380fa1b077d76188c43c/12495556927.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/gugijuxiduzu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60c72948d7---xugojivakexosu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcb02cdab2---46569834074.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/q1lrn3l1muhbqi6oip777f151v/63376144955.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7fad30b6b---zazosilodudisesewadifek.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/vumomixekuvolawipuw.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/98834593742.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f6f5c42e68e10bf9e422c101be33bd1e/39139707207.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/50574678496.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/19743757264.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b3bdcd128eb75a8ca4fa5ff318c54397/kazekizamupupeludanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=quantum+dots+physics+pdfPDF 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_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 17128 bytes
SHA-256: 01509ea3b048dfb463f6515d1d5ae519f5ac82f3073f39f1a8f5e777ab9207c4
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10880 bytes
SHA-256: cca1570944c5e905270cc0382f4be67d4d2d7042001f8a03464743c7c4463062
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.