Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41f676f09291cd3…

MALICIOUS

PDF

80.0 KB Created: 2021-08-20 18:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f644078729ea880b8f6fb71162af5ba1 SHA-1: 3a6c5c8f0767b6b84ce6bba5de802d9d36348756 SHA-256: d41f676f09291cd33053a60c93a84fba3d129862495149f94a765a540bea8255
154 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, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The PDF structure and the nature of the embedded links suggest an attempt to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8700

Heuristics 5

  • 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
  • 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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3424bb76---badatonugemokizizekaxas.pdf In PDF document text
    • https://lexconsulting.ro/webroot/files/media/30457812489.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ht6i4k58h7oneakd2th69rj8o0/zarepozizamuvevesevezoxup.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/64960692386.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ig5jcftf6n4a7e66n0iimrssi0/93266764556.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/46555482267.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aacf408a7a9---74855084733.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/lojagozonegoxexixab.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/18281003657.pdfIn PDF document text
    • https://wagaskar.com/media/larexulirajaj.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/49836953218.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e8f3e845f---vusunuwonurifuwod.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4032a027ad---84049958549.pdfIn PDF document text
    • http://uamarkets.com/images/file/48773724335.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/91454224993.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/vejete.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88772835470.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3953e0232---93357540698.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210723041542_ynix3o.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/koxovaxu.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/rowekip.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/64f57a60d1b93cd0711d43dedb10a8aa/nadababubolorosovuvew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+urban+development+definitionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 18708 bytes
SHA-256: 7958bfdcca04c5b570810ac8fef22de502d17ff3096955c178b66e27db7b2bcd
font_01_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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