Malicious PDF — malware analysis report

Static analysis result for SHA-256 a050131509e4bba2…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 22:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b85df1b5bfc045c1f7c76e476263b9e4 SHA-1: 6d6b81a545cd61e038c21f94fbfea636de33e703 SHA-256: a050131509e4bba2645c93637a52170615057a224980acca682634f03dbf81df
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://naturallabs.de/userfiles/file/zazugezizixo.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965e0dbc457---42685875433.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f305b246ae---texetisu.pdf
    • http://xn--d1achljw0b.xn--p1ai/content/upload/45230400543.pdf
    • http://centralgiving.com/media/userfiles/file/19707026551.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/34a975b0655ff9088d22fa330fa79dcd/nupulujeb.pdf
    • http://arebiatours.com/uploads/files/semajufanelasujorefefipo.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d1ddb0e0f---kobojavakaxotiduxutovag.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2d28c07c8c8744eeadfd04fb07710f31/59586267983.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dec943fdaf38e20e98e77ff86d666ced/solivibowupami.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b233aa56---88744211666.pdf
    • http://immobilieninvestors.de/userfiles/file/52666078736.pdf
    • https://mszukam.pl/dat//file/ripelulelutixagiriworemu.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/54c8aa8f714a7833f42de9d509353892/xisumefolixakimekumurow.pdf
    • https://vildmarksjagt.dk/userfiles/file/1186839350.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f3d02cb504a736cb0407ac0b8377eab7/13229208522.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/47c8a20162b45935e737ae3e1d75ef6b/fiwenodowul.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf142ed87---poremade.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16078ebd9dadb5---57041421410.pdf
    • https://vibangthuaphatlai.net/uploads/files/29729442038.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba82ca027---20451268547.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/3d362189d817728637a40da87ac698b0/suxozolixupamafim.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41f5b1874c---62647817381.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5ceb1701---pulixowonujafediribuputa.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95fbc1ee38---163717667.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=20+multiples+of+7
    • 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_off0000f5c3.bin
bc12259bb3c6cb6cf1ffb43d57ac9c3b5fb142025cb84cf1f821354061730896		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 16544 bytes
font_01_sfnt_off00012078.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 16792 bytes
font_02_sfnt_off0001388f.bin
b3b3619828b69546cce3e550b94abbae8118b3cad8c508890c40fe2b386bf46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1388F 10448 bytes

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