Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc9fd24f0d7207c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-10 19:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3def07894b9315c92943fab608df675 SHA-1: 1ad07a1233b320b802bc9f3dab6dda56b7c3421d SHA-256: 1cc9fd24f0d7207ce22d86feb4b5ab20677c17a3e49b1c90fe5cbfbe79c05dd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress upload directories or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa8f0ef66---13040010949.pdf In PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/duretan.pdfIn PDF document text
    • https://photofetimages.com/82309296501.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/76500564834.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/70105781005.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090212055773499.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161338ed9458f2---kinananejepasuxurowijata.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/newimavotuxezar.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/31619224554.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/garurij.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/1198250365.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/79491964207.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/32194503731.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/90733484698.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/13729043512.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/90027242531.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vijomisiv.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/vagexukakabafirivona.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/68421591307.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/92682097442.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/57424326877.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/91446035581.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/fonafo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b4e28dc2a7f392911621bd7254e6a425/95726387767.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/56591506940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=madout+big+city+online+mod+apkPDF 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_off0000cb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 16324 bytes
SHA-256: 9cb71f217de424014bf8ffb3f9681b66bab17c24bd775129665fc3ef94393569
font_02_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 11028 bytes
SHA-256: e8d714cb3e27b7ef8a33ec076d0eff769ebaab02295217f866b3f25e0c515886

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