Malicious PDF — malware analysis report

Static analysis result for SHA-256 5833e55fa383b1f3…

MALICIOUS

PDF

64.0 KB Created: 2021-09-15 15:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9376b63e09c8cab24b5ab368ca3fc83 SHA-1: d6d0447e10ab44e9702b69281796f1ec26302c52 SHA-256: 5833e55fa383b1f3f74e4cd36352635e679d6799903119de96993d453106ce7a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

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 https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/romometupafumopaxa.pdf
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/89646775802.pdf
    • https://chiataiec.com/userfiles/Proj_Name/files/34063414250.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/wenakanilebekopo.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397986d16b8---27827490976.pdf
    • http://tanabuauto.com/js/upload/files/75674555822.pdf
    • http://xaydunglenguyen.vn/upload/files/b5c310.pdf
    • https://asiquim.com/ckfinder/userfiles/files/tunasaridejivodoxoxujavi.pdf
    • http://praxis-greve-polley.de/web/editor/files/todexigekemutirazepinuxef.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/o1k8uceqrjccdl29g0u1qsngt3/saselijovogutobivoropew.pdf
    • https://floridahouselottery.com/test/userfiles/file/xupajosegokoj.pdf
    • http://amghanoi.com/images/ckeditor/files/57004535435.pdf
    • https://bakwanudang.com/contents/files/fuzolof.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfef183605---93256086521.pdf
    • https://stotex.rs/files/legurewupelapunet.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/88595185714.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49bed4948---keligutuwepazakinir.pdf
    • https://viettincapital.vn/upload/files/76152969989.pdf
    • http://integrotech.com/zdjecia/file/tugenorozuzapopodopujuxo.pdf
    • https://bostaninsaat.com/image/files/wirarajibawotom.pdf
    • http://ukwoodrecycling.com/userfiles/files/22543688927.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/72nlgdtapni45tnjgstq0ldj90/90492326864.pdf
    • https://movingalpsfoundation.ch/userfiles/file/48243301030.pdf
    • http://beccaro.it/userfiles/files/46290429103.pdf
    • http://pokewaveanaheim.com/uploads/files/rurexoma.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=aew+5+star+matches
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes

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