Malicious PDF — malware analysis report

Static analysis result for SHA-256 036725e226c6ab72…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 18:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 921d1692afc1aa0a8260220acacbf054 SHA-1: 1d90d36130d2f768f2eae11a07d7ced38f1d4f33 SHA-256: 036725e226c6ab7286e106b50cf4c7c74c9c939575ebde2f70ed79fed66a9d9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://diarch.in/WYSIWYGImage/file/meroxemokuratafer.pdf In PDF document text
    • http://pensionpoint.cz/userfiles/files/2549261400.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/gopab.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/mukupisete.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6c1826a6---fasowibalumasatadixade.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096e143553a6---xafibuxopib.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/m44j3hco2arb7vqope94o414cp/tabebinololasukobo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wakofule.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/71669999018.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/ff824a9c252baad47e80d14f87c59d3d/22311679516.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da8f3fe37---35833005728.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7215d528893231472337131bfe5879a8/rugetejajuxafinulitiraza.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/luzeta.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/risax.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/jumupojalejoludedun.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/fogagules.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/67763906755.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/piwak.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a954768ee5a---82968589729.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/11100109806.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/lefizaxoti.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/42655030875.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c69a9e05d---gabenasi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/61eb050e67b9a76b190318164801e25f/97628715248.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/bogafijoravosine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=teoria+del+buque+flotabilidad+y+estabilidad+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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 18828 bytes
SHA-256: 186d15fa5d1a670f4cf59b637b675bbd4d97df5d8d9361dfc4be7d2bf45125db
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 10852 bytes
SHA-256: ea20735a19cb2320dbb34e4e6866eefbe917a2c8b774264e17cf6a0af16430c5

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