Malicious PDF — malware analysis report

Static analysis result for SHA-256 c066c75b18ddbeec…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 12:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fe68fbea86f1092a7ba9644eb201cee SHA-1: a694fb14868d33373caea327f77d2e258f3e8a1e SHA-256: c066c75b18ddbeec2c6419edf5a0ec51f26935dc54d485de11344e4bac507227
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://nomylo.ru/uplcv?utm_term=stay+with+me+sam+smith+download+mp3
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e3bf734add45297399159d36f2802b69/rasenabajesi.pdf
    • https://planet-pvc.com/upload/files/gokutebopemezatudisat.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2fb67503---vutorakusubinagulaporep.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4768v8brp5sm7prm0n8nchgh45/20913997246.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/finuxiwunaposexi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b750a86192d---risamomezezo.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607611559d177---momewasopololezorilok.pdf
    • https://people11people.gr/uploads/File/semabikawubexetaziz.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a8fgq0tnkcnndn5hbmeqfbg1g/parulukirumux.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbafcb0f9e8---454831203.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jm202pm7mjjfgglk5ni0k4v5d8/likojikixotokem.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160abbcd593d70---32872040835.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bac938ea1dc---kasazewemoribe.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b7d9399a0---90324106465.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094686f44bd3---pomiwadeguvuni.pdf
    • http://clubmaniacr.com/campannas/file/66312287648.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0c3213f3---fejil.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b2de9458---26388093281.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jl4a7p8na7atlv179e4n1264b0/16173946016.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/80903466651.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84065ac63---48119496663.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b1u4i2n3uht5f9qvcrt7e7s0f7/18866162099.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/69129406447.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b54de2dcf---87331508141.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 16792 bytes
font_01_sfnt_off0000edbb.bin
d3abee80525269067203b6f5867f0f75b31baa4e119625f6377794b7bdf31453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 11004 bytes
font_02_sfnt_off0001072a.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16144 bytes
font_03_sfnt_off00011ca5.bin
c9bb17f7b1fef7dc9596f3d174594c7c0b1b59fb59ea4e879ef2f31e5a541162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 17560 bytes

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