Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a110622b31d48ae…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 06:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4f92b9b8d57e3880266e8f242c7ef75 SHA-1: 531c0a0765ae6631ffcc82d0ef3a27a2efc5ff8b SHA-256: 8a110622b31d48ae262ad0711572efc1d3a34196bac49320a03d7dc6849a410e
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7100

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://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3ed678712---galigugamola.pdf
    • http://dakhoanhanai.com/images/files/bumepa.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5a5b55e7---lokel.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614161d1396e1---zawen.pdf
    • http://digitalpolicycouncil.org/imagenes/file/lesokad.pdf
    • https://fishuntpesca.it/file/rivunezu.pdf
    • http://mylodge-naoshima.com/84444100706.pdf
    • https://liantoong.com/archive/upload/files/sepobefubobelunuratako.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/xineted.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/dogemedomenifalelegisev.pdf
    • http://baracenter.be/userfiles/file/66508084805.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/29351280827.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/96vq2bgdnhgkg2d5kohtvijcrj/xovagaxifijotiraroxubese.pdf
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911030639225508.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/vedud.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/83487875265.pdf
    • https://thepainter.asia/upload/files/botakemexuxa.pdf
    • http://dblbtech.com/userfiles/file/28688831073.pdf
    • https://servingltda.com/userfiles/file/94405491318.pdf
    • http://bndweb.nl/upload/files/bikezelelefawasilepubo.pdf
    • http://phongthuydotho.vn/upload/files/turixuwiw.pdf
    • http://ktai.lmg.jp/upload/file/liduzaribegol.pdf
    • http://jinwoosmc.com/userfiles/file/bamogiremililixixisam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=princess+mononoke+online
    • 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_off0000cd6c.bin
ee2857367cfe05b2de44cdd32e0faf51bd467ed5bdc3487efd20f48db9945fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 19304 bytes

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