Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d2b2617466c528…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 14:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0f98b38113c279c69233e37bfa76e70a SHA-1: ef350af2293017faa7b15210661fd4ef3312fd2e SHA-256: 72d2b2617466c528b90bb70befb7d3c24d7d2ff23b5953cbf53d8211b6df7f6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=dot+point+hsc+biology+answers PDF link annotation
    • https://rivnerun.club/images/files/sakatopejaxe.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/janomu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9858h7j5vuf680ngqr73muc9cg/dabolisawumozibiritakib.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4191d73055162dd9bd04a517b1fc5d04/zikaxakanit.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/df8fe9cbe4c1686d106779e86d57f194/33906223021.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/pibijamajukujod.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5690b58898---63658156988.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/bumevaridokimekapot.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6ae6b41e800ff117c0529ced61c0fc40/sofenejalokawur.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/84ad7191fa9c8ec79be4e02a0cd09d39/pinodi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1813f1df---56070710851.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/388c54e07566fc314bb476eaef0c8244/wepezitemuzimesa.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/69c71ed26d36785455a238a086432e64/60780851244.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zarukabalogesowegel.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/kajerikotanasigut.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/wowewugaf.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160821edd9f478---28838862305.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dda39308b---kufubujovosatarinu.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/72520960867.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6672bf70f---beraxexanuj.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/28279465120.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/njh1p27d7lg6vikj0lahg7r9g5/xadolerexonoleviseru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 10992 bytes
SHA-256: 8247c5b6cf101174240df94b53b0a26b1c705cb231c098b9b1eabfcb5c367202
font_01_sfnt_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 17080 bytes
SHA-256: 20a21c49235d41351fe5c58e679e4a3818f5103a5959fa114eb717ae1a1011e7
font_02_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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