Malicious PDF — malware analysis report

Static analysis result for SHA-256 18280553fc3cfabf…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 08:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a283db529051a731e57f12ae282a649 SHA-1: 8ebf522d4b7c544fd10f24c6d103ee5c6bbc89a3 SHA-256: 18280553fc3cfabf06b7bf9b0549ec6f19415d86763252d103205515194614d6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://contabil-fiscal.ro/mm/file/93144378635.pdf In PDF document text
    • http://voszveszprem.hu/_user/file/porojojuso.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/63761273833.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d19f92610---jasuk.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/44239441097.pdfIn PDF document text
    • https://edarky.net/data/file/nadez.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///27424421574.pdfIn PDF document text
    • http://royalgroup.at/tmp/wutozijakomi.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/76373955756.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6cff39686ab5d53d5eae5863251ee6bb/semuv.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/22178783218.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10198456847.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7c165b54d0a8c2f92dc5f101f4ae78e5/84156791846.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6hsaboamuc2gs9ef9ti1nn3597/balofudaf.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/28797263050.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10efe4a82---kotuxalajopeg.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c820314e565538af4131c7586fb42260/38632546632.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/fedipag.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/lerubupibolotirun.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9p3cpc2981mdvavfje18chq83i/21112059250.pdfIn PDF document text
    • http://babamoleskine.com/files/file/59148110657.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/famurisolubugipotudo.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7f7b0de1138652cfe6a34c127fcaf611/33441007831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=difference+between+goiter+and+graves+diseasePDF 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_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 16736 bytes
SHA-256: ded519ce7923cf2606c780c6399a77791f6acf1446a8cf7e432fc9a8f76b2657
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 10900 bytes
SHA-256: 8f278ae0be93dfbc322a2e613c190c99058e167bd4b714970cf0ee992725f60b
font_02_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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