Malicious PDF — malware analysis report

Static analysis result for SHA-256 111ed97674a07fc3…

MALICIOUS

PDF

69.0 KB Created: 2021-10-08 20:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eaff331ee1fcbc2146247c00ecd866d4 SHA-1: ff4aca70dcc373d7bfbef064a992d3b24885baa3 SHA-256: 111ed97674a07fc306b26718d904a20981949cc6afae8e62e3eb650e529b5e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://posicert.com/upload_fck/file/2021-10-7/20211007152541170997.pdf In PDF document text
    • https://sofupingame.net/calisma2/files/uploads/71413391601.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/wezowudabonelamuzadul.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/36989858952.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/fatamexojatelin.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/tepikokiwaxi.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/basomepavanike.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161369c367c274---51258900098.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39a2569e4---61547334412.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/10789719487.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/borefexorabepen.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/810ca7f6dbd371413e002cb5e7d08ec6/tosupowisoweweri.pdfIn PDF document text
    • https://remini.hu/userfiles/file/wevadosokifiru.pdfIn PDF document text
    • http://enkepharma.com/upload/files/vidusunemadijozizuf.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tukeves.pdfIn PDF document text
    • http://chamaeleon-produktion.cz/www/files/file/25095251023.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/wixodezosuzivo.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/mobaduluxozopudizedogo.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/310064fa73ad1c05efb030b588975add/vozuzivobetatewubekexi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62535200468.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cbd41243d---wunan.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/biwozejew.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614282a9d8dd9---golajolixas.pdfIn PDF document text
    • http://www.2m-france.com/img/uploaded/file/66660745341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=new+shirt+new+shoes+songPDF 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_off0000b1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DB 15156 bytes
SHA-256: 1ebc4a3f0ffa77beb29624e79d17971ef50ee20210b4248bbe757b532eaee3c1
font_01_sfnt_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 10240 bytes
SHA-256: 44ad619581fc77bfd80cae0325a39572fb0b0c7bbc39470369bab29db1976b6f

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