Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4d533c8fa5eed6…

MALICIOUS

PDF

85.9 KB Created: 2021-07-26 12:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99df39d22e29c175136fd9471f338f87 SHA-1: f0f9b640a82b484be8fe7b9b63ab43db640ca2e0 SHA-256: 5e4d533c8fa5eed69cb1bb2d843d3da0003b1ce8c3064f29627c372dc72cc1bb
94 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also flagged this PDF as malicious, reinforcing the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

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://zulaikhatextile.com/userfiles/files/83620600821.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1a5b055d9---22097599353.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/34637204162.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e462836d73c55b12b7dc5c56c0d36f82/saxoguzipegi.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4e6e42a324032b8cdbb018c9e1e478d8/vuzipegurilalulepanudad.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4ga2h64se01osfqb2cc14k7340/jikilekege.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60603f5a0---6847686699.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/50583825670.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/jokalejabufewiwod.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebozozesomosedodopaze.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/18931746402.pdfIn PDF document text
    • http://collegedelunion.com/clients/76066/File/ruzizeguji.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/31827a30a1dd2506eee4e885dd60697a/debanaxisubunimotepovezuk.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/85878727512.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb379e42bd---48595445264.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ca6d3a30d134f6f596b966009632e12d/xobinirokudeveladugem.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/jaladugirugudetiw.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e0mv7t9k3vsj71i7e520pib8m4/kisazolosekopuponuseduri.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ae1c85b1bd4aa8b962ec1b765befbb37/23727826635.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/otav33n0bf4osq8136oriv18hv/zefajajefikufukakokitema.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9cd2f1c3---wufexetepezevumesad.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/94eae45a5bb875702937fbc82fe6f63b/93998607127.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160985eb23789e---fagerukirefedifufaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ansible+windows+file+absentPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 10452 bytes
SHA-256: 9e2f678025c8ff44c10a5b447d0df32ffc52288f7a411ff30d0943a3dceb8f8d