Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee289a4ae00f324…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 12:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc10492163538fe61897405eb70a8918 SHA-1: eb7931c6dedd61e5dee3fc8dd80a7e1867ce7bd2 SHA-256: 4ee289a4ae00f3241561b1cf3c4240660ae61c27b512e16f957cc1df12f2833e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=terminator+2+streaming+service PDF link annotation
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/88160797260.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec86172ef---vigexumojaro.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/474943872.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/27734583338.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sumixazenel.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/kigebuwovinejuru.pdfIn PDF document text
    • https://dm288.com/slicice/file/54148676613.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/71208001770.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/148bb9f1ec12e4531dd6d103e317d06e/21459565958.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffafed29f---78445895414.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/45741004061.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/55955953463.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/taluzakeviragipotede.pdfIn PDF document text
    • https://arerp.kr/data/file///fatoxojife.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/soruwusazadozusokibuzoba.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/tuvulodixotinitarizupe.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/jujajikixumoresututijal.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/6361571861.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/nebedigafobixajatonufu.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/88399709316.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131730917820---1621253003.pdfIn PDF document text
    • http://djpress.pl/Image/files/19613019051.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210909_EA3C02E00332420B.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132d6d67cb75---97197055608.pdfIn PDF document text
    • http://oodow.cn/upload/file/210906185418735820o0g742pkje3y.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091312462880.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/niberakopabiluwep.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_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 10676 bytes
SHA-256: 7d60993ec07ec48e2463d5fede651092c6e381b4442082c6d0119b49adb579a3
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 18452 bytes
SHA-256: 80f1b037f7d14053174c6e4894b5de5520df3fa8f97ae21b1e5ba1a582c561f1

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