Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0593fce58922e9f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 03:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bad6fc5410b4c834b9d9d8b2331a331 SHA-1: f274f339ca70847519f02229c896bb83aaefbb20 SHA-256: e0593fce58922e9faa9a057b496e4c0a36579d2a72fa989c8df31e6324d547db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several pointing to compromised CMS uploads. The presence of embedded JavaScript suggests potential for malicious actions beyond simple redirection. ClamAV detection as Pdf.Phishing.Trojan further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=smart+puzzles+collection+mod+apk PDF link annotation
    • http://mibenjamin.com/userfiles/file/nenemulapirorutijasir.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/govodarosijariluzo.pdfIn PDF document text
    • http://demkapi.com/resimler/files/53241119998.pdfIn PDF document text
    • https://petribax.com/userfiles/file/33291143296.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210910001340.pdfIn PDF document text
    • http://workontext.ru/media/file/62989477497.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161426ebdde7e5---jonemifagegavisafite.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/zazowexide.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/kigazo.pdfIn PDF document text
    • http://mfcpavpos.ru/file/lenojewa.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nutunuxuzebebez.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465ed81e762---ravukefu.pdfIn PDF document text
    • http://patroha.hu/file/baxulileri.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/dobenubulawojizizavux.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/mevenebozakokixot.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/38144220047.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/negijunubenenu.pdfIn PDF document text
    • http://labonscafe.com/userfiles/vofibibox.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b239c913---56699770448.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/47764858117.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/34998551213.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/27226342256.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210914_10E8AF4DFBB557C7.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/88068259642.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_off0000cc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 11000 bytes
SHA-256: d331a6aaa04ab39d8d901c893b81f41f805cb1e75bce64c5c97a6e7f2dc363ac
font_01_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 20272 bytes
SHA-256: c13a95d26f8a7d453160ccfe83465fce03f6ee70e11299af88a5ad10c88b8223

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