Malicious PDF — malware analysis report

Static analysis result for SHA-256 322ebca33b0247b4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 08:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9648f4f97326aebfe182ff2ea7605f9a SHA-1: daa5e026f535b6dd8e1bd72559e09b2f0031121a SHA-256: 322ebca33b0247b48a6873bbf57fa00a9957aea744e212334d536542fb1b8f94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique used to redirect users to phishing or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f2de3b40b---73206462691.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb325efde3---rapamarufavojiwinagi.pdf
    • http://canhtoanland.com/upload/files/32243934233.pdf
    • http://wooshin.kr/uploaded/file/158499615360a49d1f17b19.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e00d4d3a8043b7f6bebeb5fd540d53ca/sitoletemero.pdf
    • https://dudikom.pl/userfiles/file/mezuvulitagumozix.pdf
    • http://hoinhikhoavn.com/img/files/sifupixapu.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0ed2f12333592058f741b454eca11505/51547088310.pdf
    • https://kodcomputers.ro/2664/uploads/47290483251.pdf
    • http://ansonseatery.com/uploads/files/sagumukikinaw.pdf
    • http://minhanh.com/files/bediwofubipudowotexas.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/88f72903b7f31ef67aab99dd77186d8b/gebofolazon.pdf
    • https://aulacvn.com/upload/fck/file/musovovazasiwakesorelusik.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52e11b593b---71057551031.pdf
    • http://mulroyenvironmental.ie/userfiles/file/12559903211.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae50567e2d---besedopetozemunofafamo.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd0179e8c2---26294299755.pdf
    • http://hytechcommunications.com/userfiles/file/21520445630.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/78bdafe6e83aa20eb1b74e23acdb396f/67012319715.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/40434215216.pdf
    • http://www.perchegouet.com/ckfinder/userfiles/files/99502267810.pdf
    • https://havanic.com/cache/fck_files/file/gamegekane.pdf
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/29153738.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2160802d1---88937862388.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/03376c2b1c8b0984e4ccf16aa31b6c4b/galipabevurobi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=eftps+direct+payment+worksheet+short
    • 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_off0000db1d.bin
84134c64e8cfc13408323204a2a75062de196646a46b581ac26314d399ac8a5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 18716 bytes
font_01_sfnt_off00010bb9.bin
98235154ff86a52fc46f51bfb0c44e62afafe24da756261b70e8d183001924ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 11116 bytes
font_02_sfnt_off0001258d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 16792 bytes