Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd14f7c0e410b42…

MALICIOUS

PDF

93.4 KB Created: 2021-07-26 12:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5dfced0c0921be9b9ace6a73b166647 SHA-1: 5f4de5417be92531506e6d368b7cf020db8516ae SHA-256: 3bd14f7c0e410b42700f9ca03a076782ada5081a90e7837c7b98378c56d9f3a3
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress sites and disposable domains. While no scripts were extracted, the document's structure and numerous external links suggest it is designed to redirect users to potentially malicious content or for SEO spam purposes. The presence of multiple compromised CMS upload links indicates a pattern of distributing content through vulnerable web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 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://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_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
font_02_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 20100 bytes
SHA-256: c5717e3ba37ba47e50f157f91a74b5355c38e06406a641fa630667c927528533

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