Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d50da8d355ce36e…

MALICIOUS

PDF

90.7 KB Created: 2021-09-16 02:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7872602cdc451544c274da69e40fc78e SHA-1: 877682fb4e2f32f30e19af599dbbee48d516d700 SHA-256: 3d50da8d355ce36ea11b853353d1ff4c8210923c058a9d8e767076a6b1e70ff0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites and utilizing 'formcraft' plugin paths, suggesting a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs indicates a high likelihood of malicious intent, such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=movie+hd+apk+latest+version PDF link annotation
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4636ce45e---62733692673.pdfIn PDF document text
    • https://mimpishio.com/contents/files/fevemikepusimuduvu.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/nanuxowesamobuzewav.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/88987224869.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/33375714562.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/97237484068.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/94255731963.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/62037664224.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2d89bf25f28adc0ddb89355febd66b50/livizajinoromitujola.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/xenijodonizo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991308bb4f---medadavivew.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/fovixisutedoxi.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/18566028796.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/pumiwegudesup.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03ad18d8b---12678650081.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/67197417243.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/44295906242.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/mobedakonugazofunifu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c523e74ca7---mazunawafag.pdfIn PDF document text
    • http://podarox.ru/public/files/bexeg.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/wasidavazujanolulozuse.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f9998bd6---62041211108.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa1270932---82680690679.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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 10640 bytes
SHA-256: c83e19084c2c9e3b5a872f25dae76e330361fcdba212b1613496c966206afc6a
font_01_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 18620 bytes
SHA-256: b7e0103346554451ff64a821a7178a05ac524827d7d6f9d5a9453f2d84d93ba7