Malicious PDF — malware analysis report

Static analysis result for SHA-256 daba105194d37ee9…

MALICIOUS

PDF

95.5 KB Created: 2021-08-02 20:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c61d18023de4ab399e77581be0781dd4 SHA-1: f1cee7814c9ee9af07d357d7e6188e4268a57c94 SHA-256: daba105194d37ee95f63763f97d3d6289f605b6810f5931bc56838d87042fdeb
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 acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8a4d9b099---2747398760.pdf In PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/30631507716.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/14797435380.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/81v62ollnekhkd97g8hobes3hc/runubivubamapaludozakurom.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0908b832---jexefivasuwubivivi.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/91360748634.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/10699100379.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/38383213415.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7655e8ea36e375db2d9330cb2f36f9eb/97897388928.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/51293383190.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/22220285479.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/437d570a62d665f182d50cab4f4644d4/25368514533.pdfIn PDF document text
    • http://mebco.ru/images/file/24759346642.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c404dc25ea2---93724769856.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/vqtmcd3bfr2meve5d6ghi7vfl5/78663513679.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/26278841803.pdfIn PDF document text
    • http://martonelektro.hu/files/file/29337754307.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/39066465120.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4746c6402---80609307465.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/87650136027.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/gokivibadovetozegubimuxa.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a143c2e9a---kixujadinujusakade.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/49246991245.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/pojavunilax.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/gafijirawabu.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/fabewilatoful.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86c813041---devaritozojadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+traxxas+rustler+vxl+fasterPDF 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_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 17684 bytes
SHA-256: 2f841b4b73ecc2c51cc284870d078e58bad01bd9fe85eb73b5384ca9c17fa72a
font_02_sfnt_off0001578f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578F 10616 bytes
SHA-256: 1e7ae91079030923a4d55b9dbe34d769c040cf21219bbff0789e939dd420faa2

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