Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebeb5050ecd8e7ad…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 09:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 486b9c57b9c7c5aa30e4cad46ab03319 SHA-1: 89f5b170becbcee875953106c598594ac9f3a344 SHA-256: ebeb5050ecd8e7adf0ee251498286591c118c56914bbd8e6be63d49589a1c055
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with multiple URLs, some pointing to compromised CMS uploads, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://joyearland.com/ckfinder/userfiles/files/mupurukoximu.pdf In PDF document text
    • http://qwerty.pl/_data/file/baveke.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137075814921---59957009065.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/jowuboze.pdfIn PDF document text
    • https://dacola.com/upload/files/tavudalod.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8c721e2004779637bc967834c3dbe6e7/rewex.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/kikefifudusozeliligiti.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/57415375060.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/suxuvuve.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f08b96566e---jowemifotafuvawizef.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/beduvekafokavezibadizetox.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/81084985921.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/83981331132.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/kubapotejedulogijasu.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/91099842488.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/gelawugibakolug.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/sadupizumotuko.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210906084757100.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16153a63bc3ed4---bitafipatadovedaferiwere.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/50944242743.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613762c038734---74377777763.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/nanid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=capcut+android+downloadPDF 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_off0000b1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 10424 bytes
SHA-256: 23ea1bedecc9bef8a1311906935274881c1f0013c61311225de28efaad0294d9
font_01_sfnt_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 14928 bytes
SHA-256: 9f06fb066eef69d97c454b4d038e6d0dcf81b7da9c58557d1e7b9bfa1f27b501
font_02_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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