Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d7ad9986850f26…

MALICIOUS

PDF

95.3 KB Created: 2021-07-13 19:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 334471b12d1019e0cae01468a6efba71 SHA-1: ef95512d54b20d1d28d536059784fb0fb20b65f2 SHA-256: 23d7ad9986850f26a622ca9c2bb1eb96bac2b32c564df912952af7c1e7dddf2c
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URIs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to further malicious content or phishing pages, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cgeminfos.ma/upload/file/23650621352.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160762452da2ae---29052670391.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160711f530f93e---97598265084.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/36082561558.pdf
    • https://ntct.dz/ckfinder/userfiles/files/nerafiwetopubedu.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f75810be789fc88111975e9e91ef1216/84353287618.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607588b779ba2---55370356621.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2d3c778da49f484256368da9c785f960/26672430533.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/d89ee26004a6f7ed22e4b42fb3a98259/wegagotobopuvumufe.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2806a49a5e4e180980333e6678c725b1/26597361656.pdf
    • https://windsbs.biz/files/file/puxujosekipolefu.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/rerali.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7173101007---27742393658.pdf
    • http://cnex.cc/images/blog//file/powewesoxujegivej.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160773806a3107---luxowiretiramitusivi.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f9a28585---28438433261.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bc828da10ff---33085687323.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/00fb8ab6c982222b0a9626628dcbe425/61258170669.pdf
    • https://mbbs.hr/files/nafudemulotixopirulotekix.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df406f8bd---26857270316.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b757111e74d---76776584407.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/79383803796.pdf
    • https://xenang-mitsubishi.com/fckupload/file/42559609230.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45d03b5200---51755873239.pdf
    • http://feast.to/upd_file/53694899251.pdf
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/36411864782.pdf
    • https://next-engineering.com/userfiles/files/desipirubafefiserepoze.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=with+full+wave+rectification+current+through+the+load+resistor+must+be
    • 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_off00010f25.bin
4507187a22787aee4aa5288d57c24e2db226c6e1759e68db01183ae2ec04cb7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 17276 bytes
font_01_sfnt_off00013c9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 16792 bytes
font_02_sfnt_off000154b3.bin
857c8e1d69b706054226affc74e1c66076f824dbae7d559ab5c1c9a44dee5c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154B3 11308 bytes

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