Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e817ae4e4aea71…

MALICIOUS

PDF

72.4 KB Created: 2021-10-02 15:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 93385dfdbe756211e21e97cf77569138 SHA-1: 2be88091a12f36e520f116b291e77114e630f20c SHA-256: 56e817ae4e4aea71f12784d031c58da0f96d9e64094a3ef9732cdc25ff4ef92d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage and other external domains, suggesting an attempt to redirect users to malicious or phishing content. The presence of embedded JavaScript indicates an intent to download and execute further payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8c0de999---7347842781.pdf In PDF document text
    • https://krusomying.com/data/file/netafedofebobobuwamaru.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/maduwuxemubiporubab.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/37882635841.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/ribubufuzumoworazuv.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca9aaf385d---militiwetotidujivazekatox.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/12746520738.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/pabakavulusalewasirunari.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/bezorepanumovaxe.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pofawuxonidoziputuludebed.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/xuvafo.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/pigoriso.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/47017256132.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153796e87de6---3743275994.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9635add12---xokarepusedal.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/jedeled.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/eadf27bcaedcabbd52475c047559e4e8/zifajanoxodudifabu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/josoliv.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ae92f8c5f1bbd696e5c7933fe7a203cf/25920289639.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-13/20210913063339988896.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/soxizinivolimajivafosado.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/rogowepanodemaramobolowan.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/48847385249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=important+people+in+sociologyPDF 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_off0000b417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB417 10780 bytes
SHA-256: 57146e1e14fc9a9954d9646bd95ae251b9193256b206780fb97c4008bb608180
font_01_sfnt_off0000cce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 17704 bytes
SHA-256: b94240a249d3ee19e19931742eb13003bda46cec77f7cf4ff33ea5bc893d5e68
font_02_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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