Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74a3baab57af39f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 21:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ac0055b18582a2b1b6255c028a568db SHA-1: df5555175aadcefa0c6248abd7d04434ac5a6bcc SHA-256: a74a3baab57af39f41db50c5539e74dd52786b04e0313bb4f9ea05442d34b7ac
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, many pointing to compromised CMS uploads or disposable hosting, indicates a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://mashura.co/userfiles/files/32875404135.pdf In PDF document text
    • http://www.puhito.hu/uploads/dinipowoxepoju.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910050402.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/35409763156.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/xadogomuvef.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/baderovixunizufa.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/84534586805.pdfIn PDF document text
    • http://rotang.net/userfiles/file/22883816324.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/legus.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8f2b0b95049b343116fceaee297119df/59476808559.pdfIn PDF document text
    • http://insei.eu/userfiles/files/80410792.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc00e136d---pebumetemora.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/damadabejuve.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/49591849192.pdfIn PDF document text
    • http://klhl.com/userfiles/file/xuxumudapewo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ebc6db33330a0d2004ed3f1111243676/mikovasexu.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/97479030877.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/82016709476.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/kelerim.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/zigatonezugedilifuf.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/nirowudadimakakeb.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/kofarobikuzodezosij.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/98881168066.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/40947330417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+which+game+is+most+popular+in+worldPDF 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_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 17172 bytes
SHA-256: 5c0c9008fc2ea5178dbe6de2ea40c1af4fbe6bfe593f500f69506e6973a5e424

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