Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a67b6c2727295c9…

MALICIOUS

PDF

88.3 KB Created: 2021-10-05 08:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa1677441aee9da5bae511ff43347df9 SHA-1: 75286eb2b8fd1bae0d56a6f58dfbb90abaa04867 SHA-256: 4a67b6c2727295c9ae87d3c06b6586d7a816caa5801d97acf808cedefcc31fce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a mix of compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of an embedded JavaScript stream further supports the possibility of malicious code execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=meaning+of+we+hold+these+truths+to+be+self+evident PDF link annotation
    • http://bassonconsulting.mc/userfiles/file/nilodilalabinesud.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/jupadovitabo.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/20166711704.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/miwekajevire.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/towozezamarunojovovevemu.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/fogarefesuxumi.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///73057292870.pdfIn PDF document text
    • http://editionsitaliques.com/userfiles/file/63149984003.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615b784a68656---punetawe.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/28241692832.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/64592982873.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/viremiwadokiri.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/3502276551.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gf4qaanhj8m2aam9jr29plev03/18156068446.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614cebb933df6---29679479873.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/bebimosavut.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/84090147642.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/58040280134.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134c120588f0---60767955572.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb6246aaa5---63388990105.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/munigoxipevakomi.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/16705897627.pdfIn PDF document text
    • http://rsentco.com/upload/file/90699158215.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/453b0ac39cd2c94a60089ed199494bd1/30834318800.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/97495390348.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49904696808.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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 11020 bytes
SHA-256: d23e1d9f37bbbe9f1eafc465ebf031fdb73650e0e9d2b50b940c1af0ac8b227e
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 19440 bytes
SHA-256: d8239f3cd1558b25f2a2d565baa63e626c83d1e9273b9e3fbfee7cebd7916e28
font_02_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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