Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e1a8dfa12464e0…

MALICIOUS

PDF

68.9 KB Created: 2021-09-01 08:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32346b5bb19dbf41bf2167a2010d9042 SHA-1: f56fddd218749ca1bb99dc9806985a0dad84f7da SHA-256: 34e1a8dfa12464e01df8387f530b0bc83421d9acb6867a289cd6528cf188f9ca
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier also flagged this PDF as malicious. The primary function appears to be acting as a link farm, potentially for SEO manipulation or to redirect users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8991

Heuristics 4

  • 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
  • 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://tasarimak.com/ckfinder/userfiles/files/85601915410.pdf In PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/3806827056.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210625070935.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1f0b005420c42043772c77a83d448e2a/vadojamajo.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/88004390920.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/bunusamiwa.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607619242121b---95176211744.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fovomokaponi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a846c781---xisokeroj.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95eeb7ccc1---zopiseve.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/40687376880.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b1e92d67---15329317001.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/da122c5f845d1c09cbd1321df31ba74a/jibuw.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a430a4e37cd---68132588701.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/nuzixupogenipanefofutapi.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/18937243862.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/26511378116.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1631b127b---tesujetebir.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/4821559246.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/maxifobesa.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/63917695398.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/wosixipofufawajapafimosuf.pdfIn PDF document text
    • http://allasclub.com/campannas/file/90273707755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+ideal+level+of+chlorine+in+a+swimming+poolPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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