Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9649ed75f60f72…

MALICIOUS

PDF

71.3 KB Created: 2021-07-02 01:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aa12d753b9a3ca2f6bc05f3df0e8c962 SHA-1: 9a6bff2eaebc386054e261bed435ec11daf81e0b SHA-256: cb9649ed75f60f72278e3694ef69eb39b93c0dad533ce379a6980f3710417e9d
96 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple external websites, some of which are hosted on compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to potentially malicious content or phishing sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://foundryindia.org/userfiles/file/68374001130.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3bb3b590---polebixatop.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/nepiruvedar.pdfIn PDF document text
    • http://cichanski.com/Upload/file/84695640637.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/v13voi8aqescao41e8e5q6ljm8/58339510323.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/vevidibuteranolerigike.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fb8a19b59---45552883134.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a40dd1498c6---mewisugojuzulazora.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/v2e7afmn2ro67dk0gtank3o1u5/38866886701.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/goratemumuwifileregapukem.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/turatinagagologoniso.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab327215cc9---sifisebujilavo.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/misulofofe.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5a0tu50sfvoealrg0oeaf3tdf7/jezevewif.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ret4bq8vd4f4rlcs2pjcbau2n5/19862423948.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086655a8f5e8---886899478.pdfIn PDF document text
    • http://humanlitech.com/files/files/vugiz.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/15905391728.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad5c92e30---lofetejudi.pdfIn PDF document text
    • https://latework.cz/soubory/60193252991.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/41225978797.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883244a92ad---poxojuputetilodulug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gibsonia+real+estatePDF 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_off0000b811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB811 15996 bytes
SHA-256: 0efce935a7a060abead1062596ba2528a1b90dfd0a455e2182959b62e86bee43
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 10280 bytes
SHA-256: 349afdf9ab8cfd8e6225b3fafd9bfb477ba372cdd6d3ae8ada274ede213ab749