Malicious PDF — malware analysis report

Static analysis result for SHA-256 524991b353930b6a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 15:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e5d527d0b68806f1ebf206aaa17fe25 SHA-1: b24b019e820e61240b2a38e728508e91c98b943e SHA-256: 524991b353930b6ac1154322c69db8c9d6b992731f4f782c3b8698218d1c1587
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://career-id.org/ckfinder/userfiles/files/1919888369.pdf In PDF document text
    • http://dblbtech.com/userfiles/file/36923572735.pdfIn PDF document text
    • http://bruntpratcher.com/clients/4/41/419cf983043b9371e8393ecf97d676f7/File/paguw.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/83941299482.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/83090361628.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/xalinurokepavurov.pdfIn PDF document text
    • http://brlairport.com/images/file/64691869630.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ole32d9u1hrv72mnkqg2p3hloq/55052135792.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/zujesiloxopovudolelapa.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210728001108_69rx7y.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2q8htk9g688hj302noosv02ue6/movijizazuluniwitutiwom.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/rubeperakunixaxaju.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b367dbf342d---sadotivoxojatok.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/61319166590.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074996ea1805---fuvusibefij.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/kizipijibezasisafi.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/34436786016.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160af9283c73dc---sexebajipowoju.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/59147918815.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f8b15582---30907900814.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/26ae2f6703c8f830af792c6dba2079e2/minikujokavetizuwejele.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tadepon.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/41237245245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=astrology+birth+chart+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 18176 bytes
SHA-256: a0d16eeb28f5e5a791b327d21500612a934f4e9d0c7e5db4e8f52aaae8bd237d
font_01_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 10900 bytes
SHA-256: 830322f88c6d4bb577082964609f5c7faef7d7f2b208e13610ac1d4f461da0a9
font_02_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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