Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f398ccef302b1f…

MALICIOUS

PDF

63.7 KB Created: 2021-09-22 22:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bcbabfacda7f6f62719d2bc55ce9707 SHA-1: 2681fea5136ff6e17e316f6ada9ecf27e7e29ba7 SHA-256: 97f398ccef302b1f3053493a795474ab60661f419f8ee994ba31b8cdfaa1c1d5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a link farm pointing to various external URLs, some hosted on compromised CMS platforms. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6776

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vesimport.ru/userfiles/file/lobog.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded935de08---velunelugabaderana.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/pevido.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a2d97dd9---sanixoxare.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161373f497efba---xavazonidojejeruxedoj.pdfIn PDF document text
    • http://soc-in.com/data/media/files/19357934479.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/jagitarab.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ridozigepibojodomowebovok.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/86427580357.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/69717204518.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/43455594407.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mosanurifewavebusosal.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/fodufinuponuwe.pdfIn PDF document text
    • http://inistor.com/ufiles/files/25966333495.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tiloso.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/lukutonavezakujozoxofowut.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/49206038207.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/gelixo.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/45486765355.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/xaxizuwarokoxekesuwolu.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/58047605942.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/fuvadutomine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BF%D1%80%D0%B8%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%B8%D0%B5+%D0%B4%D1%80%D1%83%D0%B3+%D0%B2%D0%BE%D0%BA%D1%80%D1%83%D0%B3+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BEPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/jigesotizipiwisokurag.pdfIn PDF document text
    • 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_off0000b11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11C 11252 bytes
SHA-256: 07b0b353e367832735c72979ea11b948d47baf78a6ccb301dbd87f6985f2a599
font_01_sfnt_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 20456 bytes
SHA-256: 83d32b54514ac0923782b4378e7c8674f1e8b980d3337c77b79192f1d74bf28e

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