Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75790c4d84068f9…

MALICIOUS

PDF

55.3 KB Created: 2021-09-28 05:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a4adaeff482aa796a83cca2be020b1f SHA-1: 37448c089baf64843c58a6f9a6cf07e952cd5c12 SHA-256: f75790c4d84068f97f88bd10f5914491a7c26eabc1792866082b2a60a8b64cd2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8155

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://abwfinlay.com/uploads/files/87314379217.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c81f08397---daxiravidevanosuvuwaja.pdf
    • http://pumarecovery.com/userfiles/files/pejarazarubufar.pdf
    • http://hycxchina.com/filespath/files/20210902001215.pdf
    • http://xn--q20b13r9leepaeb.net/upload/file/202109091731376460.pdf
    • http://numere-mopede.ro/mm/file/viverikosisesexidunawot.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/81918760189.pdf
    • https://ruta.hu/ckfinder/userfiles/files/mutif.pdf
    • https://pioneerlift.com/upfiles/editor/files/tedekunezimimezeten.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ab51ae7c6cd28249c9931673480957cf/badezuzobudovoxosupow.pdf
    • https://o2opr.co/userfiles/files/rudibelujomuzowa.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b2bdv9divvue13mq3gqfmi9ot5/45991891868.pdf
    • https://copab.tn/216mag.svn/uploads/files/19089390425.pdf
    • http://wwpokebar.com/uploads/files/tenowal.pdf
    • https://foundryindia.org/userfiles/file/wakupusa.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2583737fc---fipobutetopidazugonilu.pdf
    • https://cr2tek.com/userfiles/Proj_Name/files/tesezaravebotanani.pdf
    • http://hongshengfish.com/uploadfiles/2021091904292452567.pdf
    • https://noelex22.org/userfiles/file/zupige.pdf
    • http://www.jasfec.com/imgs/uploads/67294460544.pdf
    • http://gesundimjob.at/images/content/files/furalogenona.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/22849677509.pdf
    • http://zjhywt.com/images/upload/File/favoworitetijazogopov.pdf
    • http://technoprofile.ru/userfiles/file/18642403700.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=msc+organic+chemistry+practical+book+pdf
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/38269640739.pdf
    • 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_off0000b8f8.bin
fb0f9fe4571d62e0919b0c7d3c8f7d031417ed273d65af977813537e7c54bf28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F8 11408 bytes

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