Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3f047c4a2ee6ba…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 10:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2c498eaeaffe1d486c870517d9dda62 SHA-1: ee104dd569c374abfc1033dc4ea6bf8f98e3d932 SHA-256: 8f3f047c4a2ee6ba255a63dfdf588f064fe3e4bd306f8a29a7f200541db4bf07
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate the document is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7782

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 https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b5dac00f---73656812755.pdf In PDF document text
    • http://bakefruit.com/uploads/files/202109042207559157.pdfIn PDF document text
    • https://31app.com/userfiles/file/54281114518.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/80966052627.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/l2r0i01ljqdnfv5jbgojvfhmn1/73318252250.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f308121e8c---sulumadizurosononago.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xoxokobigoradolovexaxox.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lulirutumoxilobu.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/juwimulufav.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/wusovegobulabakubukiv.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/wolin.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/31803879155.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/99353256268.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210907110832.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/wasarelen.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/67629331724.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/gezubododowitegovufajutij.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/kitizuvesikolarug.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/23445403224.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/dijipuborabemefepuvem.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/rokilubopo.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210910_090526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=book+reading+apps+for+android+freePDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210910/16312440386281.pdfIn PDF document text
    • 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_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 17884 bytes
SHA-256: 845dbcde6fbf1b4f7af5a834ec2497d5d14d4a353a9d508b1825721a33570b9b

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