Malicious PDF — malware analysis report

Static analysis result for SHA-256 936113c6543d4bc9…

MALICIOUS

PDF

62.3 KB Created: 2021-09-12 15:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01886ee454e490f2070759e67fb26a58 SHA-1: e328392887391d0a313ff25475bc9b347958bbf1 SHA-256: 936113c6543d4bc9f93020607179b3fafefa2d0fe9170d281faaec02ae2f0799
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5512

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://noithattamphuong.com/upload/files/sinadazabalasazipumel.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6f813dc8---78773027554.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/biadhj89hlg5sj62q7ccuja75l/44306719236.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/79594775148.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/17736392204.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/98639922221.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/koxomixodifijotulovidubu.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23739517883.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/pazenekizija.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/venazedusokiwitademux.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/womufefowimevemu.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pitoza.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/jisezoxikunebok.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/89640525401.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/lejizesilukegesizisiv.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/dubupum.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/34269058707.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/34236359719.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/i2575p8noii67qnij3lsots3j1/10965553372.pdfIn PDF document text
    • https://digireg.at/upload/biwedi.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/sikixiruxijovivirewotip.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/xumimopemenuluxiduwifapan.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/38936938723.pdfIn PDF document text
    • https://onecre.com/images/content/files/remos.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/munujukutejixe.pdfIn PDF document text
    • https://kawanmto.org/contents/files/metalomewavamujuvadili.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/334767b92dbc0ceaf33f3e602ae07886/dosawebubimatugoxapamel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=american+association+of+chemistry+teachers+answer+keyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 10828 bytes
SHA-256: ed6f9352e9391277e4e5b08cfa2c3d45d2a28dd021bbcd16a1e3466171ea6ae2