Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac28ecd637725a0…

MALICIOUS

PDF

69.9 KB Created: 2021-09-17 05:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9449fcfccc22edc8183a3445f3c40cf SHA-1: a8c3fc0369113f46aa3a951450afe9f100b0df5f SHA-256: 4ac28ecd637725a0dd1e4ecd018b3a2ef2b4a4a41a1bdeb105d6c5f424038d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://lamgi.pl/ckfinder/userfiles/files/6492212034.pdf In PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/dipevuronapukefonotis.pdfIn PDF document text
    • http://myslizdrave.com/soubory/39803090280.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/difotaxetaxodajilubakemik.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbeaa73f0---jenosapufa.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/655734710.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/ximobadovelezetazuroxamiv.pdfIn PDF document text
    • https://webmenuplus.com/images/file/25988325272.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/86294009721.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/33650512691.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/ruxisikiwosuwerimo.pdfIn PDF document text
    • http://otczenacts.com/media/files/72820678825.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a735d73d3---doradawaluwoj.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/12269406501.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/vebarabi.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091710041439.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/xupiparelalunevujojijuju.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/93984228296.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/f777332db2c94ce8618d6c0d3089d552.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/33423115616.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/sodadavufe.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ij3m38eijmtsm6vej35tiv8b70/58934190149.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/23369195841.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/dogizizudakovujasagutun.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///morupirazinetemiga.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/tumadiralolivutufalixoliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=extracting+files+on+androidPDF 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_off0000b3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EF 14812 bytes
SHA-256: cffaef1a49f8df03ad5997e3bbc3c29b43a259707c9af38261081dadd6cfe52b
font_01_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 10736 bytes
SHA-256: 0e74e4d3b1875c32b6f90b62d28faf2c6bf4089d2de10357d47822ac83887093

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