Malicious PDF — malware analysis report

Static analysis result for SHA-256 9923ceb87e48f05b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 12:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da2886c43c0d6a3b39de319705928cdd SHA-1: 072f50f0f8bc78276265ab0451445ae5ab6fa092 SHA-256: 9923ceb87e48f05b108b29a9d850a281e3bd9f95adab511055d093c23fa8e95c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of embedded JavaScript and numerous external links indicates the file is likely designed to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=gocut+glowing+video+editor PDF link annotation
    • http://honeycontacts.com/uploades/userfiles/file/5496644726.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/vesuvoviperivemodi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e57487f84a---27803811792.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/biborana.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/pupuka.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210906_030016_2153.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7e803cd3---64927908109.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/60343078903.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/65101384367.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/sebupasimikinogininixam.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/58729180378.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/kafanomisunar.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7914dcfc2---12311568411.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/31649653783.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/79558688815.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/nudonumelomarageketetima.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/49696414708.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/80960876751.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xusun.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/77216540022.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/49818721840.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/11070183492.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df04067f34---81488565381.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nokeritexuzawonaxixidome.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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 10508 bytes
SHA-256: 7bd5511a1116ef18e957e42fe8763b76045100f79c95d84c2603032aa267c2ea
font_02_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 19336 bytes
SHA-256: a3ea141f03804141bd90334aee2c821dc3bffef64fa87d08ed997616df1280d4

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