Malicious PDF — malware analysis report

Static analysis result for SHA-256 64773304407c92db…

MALICIOUS

PDF

105.2 KB Created: 2021-06-26 14:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb0c5d800016f0dcc9c6fa1198b25025 SHA-1: da03b1566b54f26566ad37b932bd0d392110f2c3 SHA-256: 64773304407c92db54a22eaa912a6865033611e2c15b3d60480cc2eb5b881591
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the document's nature as a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack vector is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • 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://smidgel.ru/uplcv?utm_term=logical+quizzes+with+answers PDF link annotation
    • http://www.anieliasfx.com/uploads/textareas/file/doxerumarawelexedijora.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdba52578d---91244640929.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073b39f19b63---40811594128.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4ad8f26bfdbc652041c62b036d5003a9/2266754277.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/50643378376cb41c4d5b46ea3fafe748/numebufezekorufigometu.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/21395841060.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/8sitvr2e5hvgmo26cil6i1g3e2/35443837731.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/vibagazoju.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/55118005880.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1066905237a60c013a1ee44765b1db40/62203730579.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/897fc64f9ca5be74632e80a681be2d8e/23890531155.pdfIn PDF document text
    • http://canvangdientu.com/images/file/61205692160.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c41595ec4ea---gakuxuzukarefabanumumu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2hrtm4297u5k0fcqklpv3blcvp/sunesoligowutaza.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/5449124642.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/hbjpc4optt38ldpg65ld4bn40h/nerilidasurosiviwubife.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/aeaa9e715daf0fcdefd5f5bf7777daa2/bozikewekabemozaz.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210625102957_712568536.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160938330cb621---bagajum.pdfIn PDF document text
    • http://slsnn.ru/content/file/wagigav.pdfIn PDF document text
    • https://coevent.ru/upload/files/52418027392.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2864844618527031b5ceb532378991a5/videvaloxavelemalipol.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b753e5c35f---75750884271.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EC 10856 bytes
SHA-256: 7afb94dfaf5d5de6d31f637b384e546437456be974887e33a1ee917fd8f4e1a3
font_02_sfnt_off000150c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C2 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off0001663a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663A 18640 bytes
SHA-256: 89b37b81c203d2783ec2b724fc768ec5edec16b7db44f5f1a5b2b49edd10092d

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