Malicious PDF — malware analysis report

Static analysis result for SHA-256 084f2b3bb77db4d1…

MALICIOUS

PDF

64.2 KB Created: 2021-09-17 04:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e3d292e3985d697fb90aeefa5e5a3024 SHA-1: d525192aa9b72e6cf62466b7b100448991a5db34 SHA-256: 084f2b3bb77db4d19342034c61b3abc23824b5a72ed57edc365b5950a80d18ff
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature. The primary intent appears to be phishing or leading the user to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7120

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c6696e8d3dfb5b4b9e1400a7fe25e0eb/4698094043.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59b8a4698---sitov.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea31212c6e---50354142367.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/61221282835.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dawolulu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/76641283152.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/wedakorisujoxiz.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/pavixabenumipidali.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/19d31200fba88af3691fb9b6f383a1aa/21075134862.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/xumowiwebidozer.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/namuridan.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/jozebasapotefisenaj.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/nelupusogepusuzalexupunu.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/rimibituw.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/nomumafo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161300bb2766f7---zesabarepobolam.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/38969253517.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/mugutumenizakuranaw.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/miwixuzinibomopa.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/dutafalosidasivosaz.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210914082935.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/fepijusuxetajodemigosuf.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/sedafidiwokelojulijurojig.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/bisazazagawigarimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=totok+apk+file+downloadPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/regogibope.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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 18776 bytes
SHA-256: 73a2cb658002be8bd653da68b53f8883bebd9bc56f03e0af9c2d8811d6422d11

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