Malicious PDF — malware analysis report

Static analysis result for SHA-256 509055889a3f0020…

MALICIOUS

PDF

93.5 KB Created: 2021-06-25 21:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b2635569d1a346f9f0ba92ef8586854 SHA-1: 61a85a036b82ac9a3424dff177d3d5f5854f422f SHA-256: 509055889a3f0020ff36c6c8e95e252e91d0d31ff3abb940c5e81a8e35133150
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites. These links are likely intended to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b2913fca2---43657675440.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072a22247b83---nemenajavexebezulipaluz.pdf
    • http://aivieksteslaivas.lv/userfiles/file/timirafutafadu.pdf
    • https://aydin-elektrik.com/resimler/files/26986817421.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/61001269169.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/33022980852.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6fe86d0c24c848c47d1b86f22d306a39/danasolesezurebejanafesur.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/192914d12ca298cee80b5134496c7d76/lirameridaraxow.pdf
    • http://szakkepzosiklos.hu/upload/file/pesuxu.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d4a3f19c6b602a8d5455a437f806baa2/8771780656.pdf
    • http://aeronautike.com/userfiles/file/24806003923.pdf
    • http://gleneaglehoa.org/images/file/24488179119.pdf
    • http://beastyenergy.com/userfiles/file/sisazekasulejefazuv.pdf
    • http://vervesimuhub.com/userfiles/file/rudotidodurifo.pdf
    • https://bititechnika.com/uploads/file/fogupedetoribovoti.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/32c21529db995ca61258c8f37e980df7/13831383624.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366883d005---buxaponexogewidabosew.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9d3vos6h9c7ncth56098e9cot3/farepemopu.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fdea9e2df---15546885379.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2d9c33d2---lafalexosoku.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/55b0e4096ff65fddf64ae83167b527ae/tomexuniposesitafanonu.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/04872aa901f7ed6094f0ad994f73d965/65105599501.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/10e6n00ogquv828osi769m7p87/29695300405.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jesus+colouring+page
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb28.bin
bc6775af5c0a94bb090c552d509dbe754b1fc8de68707c32eb040753c68e2057		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 17380 bytes
font_01_sfnt_off0001052e.bin
350f1d865913c951f7015024cd6586700a517e7a6e1dc541c83083508e8a4214		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 10540 bytes
font_02_sfnt_off00011d4d.bin
117ecfc2f0cd3b249ac56a63349c9f97fdac27a01d7a11b96ed12b90f24d5986		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 19132 bytes
font_03_sfnt_off00015083.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15083 16792 bytes

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