Malicious PDF — malware analysis report

Static analysis result for SHA-256 5223b9fb221e48c7…

MALICIOUS

PDF

92.0 KB Created: 2021-07-28 06:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e589fc5bfc243bb07fda5182c6f8c383 SHA-1: 79d0457bb36c34226316bce25600bd3ccf9d34f9 SHA-256: 5223b9fb221e48c721d3b7ff77026f9bca1ad316fc3b6bc5813db5e25089595e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab642ea53a9---24483213985.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ef77179c7eb0653b57a615a1a0ff6102/48886798329.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a636a27977---megegebezojolutop.pdf
    • https://unosms.us/userfiles/file/tupivaron.pdf
    • https://dialogueinpraxis.net/files/docs/26732938302.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798e6d41a49---93214624349.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/59783380187.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d7708582e---31672348562.pdf
    • http://bestorkate.com/uploads/ckeditor/files/zokewutowabadepuvewotexug.pdf
    • http://peneleos.pl/userfiles/file/79527924442.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ff0a892d---43623277980.pdf
    • http://ottotech.center/userfiles/file/zewedosu.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/672a21d7b19c7a2cb7b922cfca0e62bd/gidovanuzinur.pdf
    • https://zoorichi.com/temp/fckeditor/file/23248121120.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd3beb134---ragozumag.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/501fb4861c77ac93056543f913e9a3de/gopuka.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d7fa46ed42c08fac673e05c614cf1e0b/bekurifuwexuxe.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc70d23d9b---nimabison.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jurassic+park+operation+genesis+download+full+game+pc
    • 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_off00010255.bin
b209a1ff0a0094f8e9920281986ec9e8adbfea7bf980515560aecedd7dcdd8b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 11232 bytes
font_01_sfnt_off00011c8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 16792 bytes
font_02_sfnt_off0001349d.bin
8862c3d6e90d2fe68e46d0b84b1611822aa15209cbb4bfab9a41c1cf2fa9443a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 17380 bytes