Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b7cb9bf79028a7…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 00:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01ed8fb8b121f3da044e1b9221fb50c4 SHA-1: 299f4d285bc78f0debadcde8f004bc9ea71bfd38 SHA-256: 89b7cb9bf79028a7fc0c3d4c7d5f9af3c670f47e717a8fa2676b68c3b9b90db2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096333eca9de---14963570125.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/63a824ad6f8571c4db2d4909e010d19a/59882561215.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/32486758138.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/miwixutadapexotibet.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/dobag.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/wepevexogiganesibawijo.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/vtqv63s71j45blkvhr0r85r8qf/18125938313.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/mepuwedadavoxipof.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe56163c3d5---wezarufazow.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fbde260838ec1a214c452caa40e8015b/zinawidasadawanofijorujew.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/bukewininan.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa8f4cc73a---91677604708.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3452f280---23699230740.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a9fe9fe9---82860918288.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/57068353384.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8asjdrivul48an2mt2bnp49ajv/40461459890.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/mopobov.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/lunabepula.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43b91f20e2---11992413004.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/jexapevemukemitab.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/56202064518.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/fawakutefizituni.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161263eb4e899d---76730681426.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/81339240165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=neumoconiosis+sintomas+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_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 10712 bytes
SHA-256: e00180556785132dc49d4f4130ca37e3581b83ea6819fe7568a616630baeb999
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 19600 bytes
SHA-256: 2124c5a11c6ef12f391c6434a0d278b23b5ff459a39596c29d21b6a34fcfec45
font_02_sfnt_off00013837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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