Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ff0f666d992b16…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 09:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5517b06c3289544dcc54025cbeb14e30 SHA-1: 2ba208ca67b19ff63d4ca889fa438b7232cd5462 SHA-256: 68ff0f666d992b16720c0bb5a54ffe501b667ad9790dc0b1a0e60f109bdca5ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The file's structure and URL patterns suggest it's part of a campaign to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=what+happens+when+you+miscarry+at+14+weeks
    • http://ahdongjiu.com/upload_fck/file/2021-5-16/20210516094846297419.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5mnm18t9564re78f4td53rg4e6/watitorujurebevozof.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/bceg8ao13g89hvtcv9phm9gdg2/50300119012.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rfaetnkf73cnonid8fgmvaorfl/50890208878.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0191bb7b41c11cd20784ea7cfcf4d7d1/93711449631.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/2jis92bkdcqcvil0h4ru4js61v/97011981293.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a3786564505d733430f581a5c21ffdfd/kilofonabidugenaj.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be815d1a35---73950587972.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ed06ae07---27186176081.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ahasbovj241a4h8aff39pfl801/60959073288.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9b1mtm32rvcfvs0usodt5ke494/kiwuzonanotevukebewabe.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/17924222182.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/pimadovodopuriratevabikap.pdf
    • http://strategie-online.net/catalogue_dynamique/file/73963697643.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/tutegexeza.pdf
    • http://xinyuemu.net/assets/202106/files/20210615182927771719.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb43b1261---33512926738.pdf
    • http://apexibd.com/uploads/fck_uploads/file/gapijodolibowatenat.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d9b7eb4f---65440691705.pdf
    • https://holocaustresearch.pl/nowy/photo/file/malukunofewasetepubaxo.pdf
    • http://tmfconnected.com/clients/6/67/67cd703e63b47da0cba1438f70967d25/File/41733138083.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d307fb8082---39057875811.pdf
    • https://airshow-bg.com/file/67835020918.pdf
    • http://gilendor.cz/userfiles/file/dikuwidakopelobefaba.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bab4c77fd---60295911081.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 16792 bytes
font_01_sfnt_off000118f7.bin
69b7b34ea384124c81685457efd904c140f173a98daa555b7479574ae890892f
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 17008 bytes
font_02_sfnt_off0001451c.bin
022c50d71c2e21a229db4bc3c5534ceb48ea9191ca7dcaafde7816afcc9ff339
pdf-font-stream PDF embedded font (sfnt) at offset 0x1451C 11108 bytes