Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d89ff03cde52808…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 13:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30c9869a60f50d4680c0bcb05ad40fa7 SHA-1: 7461188ef7088c6e4d0159a8af3ac8dbe61252c7 SHA-256: 8d89ff03cde52808f46bafe969b77378c4974086ffe1005ea9084d02f4384528
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://synerhu.ru/uplcv?utm_term=exchange+calendar+not+syncing+with+iphone+ios+13
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9efebbab6---113956376.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/2098482721.pdf
    • https://faktxeber.com/resimler/files/vonov.pdf
    • http://elrey-uslugi.ru/media/file/batasodosujisasi.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5319de2e4ebb82f7cbbdb091edb3b558/vodijuvaxipewezo.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/dbe0ef40467960f8c1976debb9178f5e/xuxegonesimevofato.pdf
    • http://teplorium.su/userfiles/file/55017792225.pdf
    • http://stoka-saarlouis.de/userfiles/file/mofujugeledigavokorivite.pdf
    • https://rpdev.org/ckfinder/userfiles/files/68568131961.pdf
    • http://seattleteriyaki3.com/uploads/files/59645925973.pdf
    • https://intersat.lv/files/file/ribejibovuxojatavewufanat.pdf
    • http://pscemetery.com/userfiles/file/85094031719.pdf
    • http://yotlist.com/uniformkontakt/userfiles/image/files/vomezubakegavepenosak.pdf
    • http://colantuono.it/userfiles/files/jawetupo.pdf
    • http://grupafurman.pl/!mag2011/userfiles/file/nigomanugaxidonunaruzow.pdf
    • http://agama-rc.com/upload/files/solunedef.pdf
    • https://planet-pvc.com/upload/files/fudegedabolunaguxamowofu.pdf
    • https://cevhertemizlik.com/userfiles/files/82824343491.pdf
    • https://themis-lex.com/userfiles/files/jujegiforagixajegox.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/907facc5f5ffb010b4c24d2940bfe888/zeruwinuzetujimoruka.pdf
    • http://infinijewelry.com/userfiles/file/zogudelatilezega.pdf
    • http://sz-nuoyi.com/Upload/file/2021093016271339898.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/vawifataguxugovotowum.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcaa50c261---sumerorizitur.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e940e4d5---23812992585.pdf
    • http://kant21.com/userData/board/file/ratejipumanu.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_off0000b722.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB722 16792 bytes
font_01_sfnt_off0000cf39.bin
2bbbfa799ff26945659be1cb7843ba980a2e7080e111ddac22eb3fe05a1e963a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF39 11304 bytes
font_02_sfnt_off0000e9ad.bin
1634c33baa2d7511f1ff37edbe3e5c75530109d0a3f0a7e4869f52a50c81ee9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 17696 bytes