Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a325bfb12b077c7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 07:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c3997763970fbd4a7f3110d8bcee509 SHA-1: 526938a842e54f83b3f309c5b902d7c5d2559ddb SHA-256: 4a325bfb12b077c756bfacc3ead03683961b0f6800894c106ee4c0d32bc9dbe2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=all+binary+compounds PDF link annotation
    • https://getracemirates.com/userfiles/files/dilajutofanajol.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc8c5392e---gatatub.pdfIn PDF document text
    • http://suara.ru/img/file/99216454021.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/85545313664.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a92f205a8---zanodawuzaberiwevalaloj.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16074549fa7d5b---basapej.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/19557cf3d792250eabc01ccf9e911529/tosuwipuruwasewukosigu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddd4c703b9---rugomadotusovupawej.pdfIn PDF document text
    • http://chikatere.com/Upload/files/50032108888.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110e88e4dcd6---99149608074.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/fobepib.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/wezilus.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/judawizawanositi.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/minolutinepanubetivetox.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/2432055935.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ef0e51de709857534621890a2a3fb38d/47764873409.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bea6019c7a58e92316e29ad1408ae324/takezowukovaxuv.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3479fb7830d188b4c16be0e6d05bbbe8/subirakodofepoto.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/51169289752.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/60607936985.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bad425a3689---11053942818.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/22fb6bec9469a0256ffed698c8b22044/bomasevasebuzap.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/kukizarewiwon.pdfIn PDF document text
    • https://kenadong.com/contents//files/ruzebe.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_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 17976 bytes
SHA-256: c84aeaae11b0704ebb17825cf96df4535308e143514cf7e437150bf857676611
font_01_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E60 10780 bytes
SHA-256: 6aeb7a0fc3129c4289e648c2e994c85637bd0ccc1b6103ff31c4ddb4fb4a93f8

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