Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b49e9f35b4925b…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 18:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d3f97bcd13e370df709117638d837c97 SHA-1: ca22be4463836be1285f57376ffc5b279d2b37e2 SHA-256: 00b49e9f35b4925bbef6470f04e0e715d9b2c10f89e7c70b6b45ea094c34755b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and instructs the user to disable security software, which is a strong indicator of malicious intent. The presence of a fake CAPTCHA further suggests an attempt to trick the user into executing further malicious actions, likely downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://styliststudios.com/imagesTE/file/84248516753.pdf In PDF document text
    • https://mangonebike.com/uploads/file/dupil.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5d1b6206---40911027332.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f95983655---wemanusatenevonogofina.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/88003139739.pdfIn PDF document text
    • http://fitviewer.biz/files/file/29712071766.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/43fc4ad64be61fc0eeeddd0f56d474b7/ziril.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b44bcce45---suzobo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070723b687fd---fonababedufo.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/96828633231.pdfIn PDF document text
    • http://fxmeat.com/upload/file/d5fd533d4c616d13fbea57e999176e77.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/86132361374.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/zugojuzumejazame.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p2caes6rnr30mrkl5nd0uvllui/nusaxo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/afvbbhrg7enm894o1sqpvr5kq5/tegikagawesusuzajidufivu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bf9qi7d8fni5ib164cneia2e44/gapumonodirumidala.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dbae00fec9cd9a9f0fc758a72d54e351/87542385755.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/63147937177.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c668b8c209d---jemasatolabilubobet.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/notinavudak.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c303b54edfd---jikaxemobowopibexutedife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=is+igg+games+safePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 10040 bytes
SHA-256: cdfaf6de3265c6c72fcd2b299c5bf62c21e932699d3cdc6ed7ccbf6fbf11c0d1
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 17836 bytes
SHA-256: 46b350ee8fd8e089409ce859b8297f6e04fdce7fb356a7f59df0efed02162985
font_02_sfnt_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9F 1900 bytes
SHA-256: b1ec494aa8406f97f0fa1e39f253b83996f2344d59dcf65ebe63bb01d788caa1

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