Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf205eb221418e53…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 03:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20fafd895facef62807751719d00ad3c SHA-1: 8a650bd0b18b06cce0b89f9145a2ec08b82e402e SHA-256: cf205eb221418e5398bc43520313282eafc5d11df2fb49a5ef112de4d14327ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/fut9h3sq7eqh6ifglpohqe65e3/11398773194.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f8353620e008fd1c2029537d14d86f25/92129714895.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5otgksdlcde2ocjoacg2uk6ce7/31724316220.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160875e5213c6d---zupolodod.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984dc3c5341---36506811017.pdf
    • http://automotiveenergy.cz/userfiles/file/39254795440.pdf
    • http://euredit-editions.com/userfiles/file/tavuxegomagu.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/79200726701.pdf
    • http://wittlich-luexem.de/userfiles/file/waxiruxalilosi.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ca8cbedcf5591c233939a21e1b28f9a4/patemuwumow.pdf
    • http://kulturazebrak.cz/userfiles/kefomeketosaxumaz.pdf
    • http://diamond6ranch.com/userfiles/file/51223988596.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d57fe666758b922a6d68be64491e84d1/82680719671.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160acf2a4ebbf4---dapilekepekabomeribowanet.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6fcd653b4---gotof.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2c1518ba788ba3844639e9a54a26b466/fopetawewunelegilag.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb4d5b75d2996e063a2555059d930359/faxadoxalononaterugiteboz.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38842084a---6082909088.pdf
    • http://msslink.ru/userfiles/files/50444677846.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/966q034ahul2con9f7f48tu7gk/73402673128.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160766892965b6---17966207296.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/106325d0004acbde7438bf27809614d1/48045999726.pdf
    • http://benhvienlaptop.biz/userfiles/file/lutofofilozaginev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=60+mbit+to+mb
    • 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_off0000e560.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 16792 bytes
font_01_sfnt_off0000fd76.bin
be4f2a393c78d0162f1fc8d0b7c66e1be8d8eed33c2af3a033d3aefdcfbb4110
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 9888 bytes
font_02_sfnt_off00011330.bin
5aef6d2a8ece51482b127c8daa7c1a0cf5c7bbd6ef8bfe49d5c879edf4922660
pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 18580 bytes