Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce3d13b6aebd725…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 04:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 930814585f43b2a948309eaaeb5c344e SHA-1: c22cc533726c2c0e4210999772767c7de95b3321 SHA-256: 9ce3d13b6aebd725d9e6cc44754c97d0e3f46f5a89f4b6359d0a4e8a3679800e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities to execute arbitrary code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to compromised WordPress sites, suggesting the PDF is designed to download and execute a second-stage payload, likely a phishing or trojan component.

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://crewmak.ru/uplcv?utm_term=chrome+clicker+extension PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85758521a---sadejixigo.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/jelabukuzimebozabasamo.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/mometanujoxuvekipanunix.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2a3238d1---disepimowomapibaduguro.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5773711b---89493132949.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/23270790301.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/78203993505.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/mojijekevezumokiwoju.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/pawamidu.pdfIn PDF document text
    • https://parfumzone.ro/files/file/xofod.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/p1usmgiq3ius17p82ngpo1puu8/14522887438.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lstrbgk36a0b5rm69ao66u6110/46136063696.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/42781489175.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbbbdf897.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/36245309541.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/kopopujikigegasexerifenad.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/6dlrs0moor1suacqlnrp7mg4qs/kiwipiverudanogetezaz.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/gesadegetisamusaberam.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78c79e9f2---53575961633.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/92074489118.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/54927776207.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/kebuleluzubemalej.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/iu5kcbalkq2flrvfkqsbkos054/55848589794.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/42779249210.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_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 18444 bytes
SHA-256: 1fe6a0c099528aa5af17833b3ec01de168830733706bedaf4dec19688c974574
font_01_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 10560 bytes
SHA-256: 53d598777e4c91a56f3c08cce3cdc62e315f1fc493a6bb751e7a024e3177e09d
font_02_sfnt_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1