Malicious PDF — malware analysis report

Static analysis result for SHA-256 280429814b47417a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-14 08:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f72d837a8aa9899bab677362d06ceeb6 SHA-1: b76083260db13d79754718de9b2fadbdd55ab590 SHA-256: 280429814b47417a6342961347d8abeaecbe37fa33cac66fe3d32c98e6bd6824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate a link farm on disposable hosting, with one URL specifically mentioning 'download kingroot app'. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=download+kingroot+app PDF link annotation
    • http://maybomnuocdanang.com/uploads/image/files/29206064961.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/mizutibe.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/jeviwututuzeboduvizin.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/fasajur.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136dddb8b980---63680393742.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/1044053431.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/14914383893.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16137a09edf88e---55934446069.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16136d22d79bb4---21852200102.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/xaxibe.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/laguviwaz.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/fadiriziwegufinuwam.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45713232363.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613970224193d---xofesupezilemunikoxam.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/togaxobaniputoforiga.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/kelepi.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/78741382211.pdfIn PDF document text
    • http://dzbnf.com/upload/file///53596706470.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/30418585655.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/25621334199.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/46083807460.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6d89369e---zavarezijugafutadu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f83f18eb417f8a34c8066eeb74aeb378/bobovuza.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_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 10444 bytes
SHA-256: 168fb6fbdf83bdfe1525695a8ef68641582de67edd3b182c2b5acf8dca012df3
font_01_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 18532 bytes
SHA-256: 21289ba78756dd70875380ab8826d3da8e0957d4fe415af2f8591c66b3e84253

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