Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e790fdbf1c99ed…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 21:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4e8d0a9b7062ab38babf086cc0c43b6 SHA-1: 668f33f619619f6d8bef1455069dbeaed6f17c6e SHA-256: c0e790fdbf1c99ede3a1885152bb00a862e9e64fabd8844fbaffcc0ea47d7152
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=does+live+wallpaper+drain+battery+iphone PDF link annotation
    • http://serting.eu/userfiles/files/gevudaxuvuk.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130404c754f2---xitexejarufobironawese.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4437ef7e---xatidebelisuwoxizuxogaku.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/rewatoxak.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/susexosaxawidisu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613864093ba4d---fasarozetaxuliwevi.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/21668200013.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/juposakisososup.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/nalorujopolopiwefetevota.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/61458096802.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-18/20210918072101807374.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/xemelo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136b45081e3e---garozegomuwesosuzupom.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/74769770114.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/wefepelatepokerolaze.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/88816931760.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7km3cl5bjblglohr1rp3s6it6c/mukumiganisosobofusik.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kikemewekinotunabodibux.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/23070563384.pdfIn PDF document text
    • http://egitara.com/upfiles/files/64031536152.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/95243007768.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/lukiporamabuxoxabotujif.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/95980862705.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/35113346528.pdfIn PDF document text
    • 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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 20260 bytes
SHA-256: 0358560d794f5c999a5bfe3fb8f5f653838afe722b4703db4e579e9be76b5b78
font_02_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 10896 bytes
SHA-256: 5fbf7ff71ec66845563406a950432432e33de20c8609f4ee27f3745b3eb7fa50

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