Malicious PDF — malware analysis report

Static analysis result for SHA-256 f530e9d30916903f…

MALICIOUS

PDF

102.9 KB Created: 2021-09-07 07:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ec52d4ce0fa9f54c4dc662bc92f94e4 SHA-1: 73c5a5b29d7f7d1c6e73d75cb89c32df0d7eb174 SHA-256: f530e9d30916903f8128cea5b841fc0c5131a77a05543d7e7516bf724055645e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farms pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://nomylo.ru/uplcv?utm_term=types+of+die+casting+process+pdf PDF link annotation
    • http://hanart21.com/files/userfiles/file/xubomupojox.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/dojonojipurubelob.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gazuzuwuxegamirav.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/78212184039.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79723d3d73---62708716359.pdfIn PDF document text
    • http://kaies.cn/upfiles/210731232046692073hijdsu.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/99497250964.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/zazivo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4c140f589b8d29f75504fad2204042d9/15262191673.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/11939501529.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43c1dff43---82481357426.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kn6rqbhthg08lpqpabs3f5rnl7/31072963426.pdfIn PDF document text
    • http://atomleasing.ru/media/File/mizororomogezivakewuzoxe.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/50273802661.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/j0bbjc8rnietq7aniihbcvc468/buwuguj.pdfIn PDF document text
    • http://saaretravel.ee/images/file/65509736126.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/ligitifanokekejuzuwuvazer.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/6322980915.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607505750869d---38395583617.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/reparep.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774997e6b2d---radofugagevojelapiboxalol.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607246c2e5742---20841656628.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/26857943154.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/36725447677.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109051553389313.pdfIn PDF document text
    • http://chenruichem.com/upload/files/giwokifonewoxu.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_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 19508 bytes
SHA-256: fabd4966cdfb66719537b8ca01c35675a497b2089612520f2bf2c7a4a95b5336
font_01_sfnt_off00015cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001750d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1750D 10824 bytes
SHA-256: 15b853d5aa24df2ee27588b423a7b6e2dca648854e6b5a7da4782cd24a473737

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