Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1546a1e576cf6a8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 18:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c062be5e846d5df29cc346df974d8d40 SHA-1: 44b26fe020219be07f1ab08a7c92c92d3f9747f3 SHA-256: f1546a1e576cf6a8e69fb84d41e2a914d26690fb9b85ee60683e569ae93d4a91
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicates malicious intent, and the presence of multiple external links aligns with techniques used for distributing malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=god+of+war+4+iso+file+download+ppsspp PDF link annotation
    • http://www.sport-konyv.hu/userfiles/file/84907374938.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/55499163766.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bf5089c87---14790170492.pdfIn PDF document text
    • http://millecolori.it/images/file/47980036641.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/sexakizuvebipam.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/78681765454.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614798b0bfd81---34273689735.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479430c19f1---21454775872.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/77664824931.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/piwozo.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/vikujewuligon.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/pizadixalavotobureg.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0189a6552---45994080618.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210915222146.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/wutixomaw.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/67203041428.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/77268003185.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/wurudujumugefokusew.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131702902474---31484938364.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/28357859963.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/89881381506.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614309d3c41e1---40050405199.pdfIn PDF document text
    • http://df-2.de/images/daten/file/wovotu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2e7c9911212ec17b371248a96e6e2957/belutosiwo.pdfIn PDF document text
    • 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_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 10596 bytes
SHA-256: 877078001ba8cbe781a619f922871d5a541f52fd7837d53153810c18e320c396
font_01_sfnt_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 14840 bytes
SHA-256: 3ff6ba94bf766751ae1c933544fc09aa8ffef927d58ddc7dbbb19c99cc3fb743
font_02_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1