Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0184267a14d246…

MALICIOUS

PDF

60.6 KB Created: 2021-09-06 07:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e516f6ec32f01efa9ccbf0666b71d13 SHA-1: 536905656c2e6a6c373aa23b8f2ad2010a68ca32 SHA-256: bc0184267a14d246bd033063ee3ede56b533bddbaeae72d9253474601ef62074
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites that host further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9121

Heuristics 5

  • 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.
  • 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://jmdfhjl.com/fckeditor/userimages/file/milomevezi.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7610963f5b9dc64e408ed785ef239982/37387979238.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0181c8830---ranunitefufagi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a60b0f33---wamifegedodokavuzawekojob.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gesuruxi.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b5080033---ragid.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/dikaw.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fb3db38a97abb95c0be7d924b9d98b83/ponemogusuxezalu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077cad2bdaa0---molelifofixaruwekexurok.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/1888973420.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/7593628162.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/dipodikazewusa.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/visisiwo.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/padikepajonexosikure.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884aecba6a2---3007143379.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/70440864351.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tameforekalarulawudax.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/25986072900.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h06bqfe9ntgonr6rpjcgl979ag/19420863218.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/woxetabigetixoviku.pdfIn PDF document text
    • http://pneusmarene.it/images/file/jugifut.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc21d5ae779---30992615389.pdfIn PDF document text
    • http://etre-belle.su/images/file/38133286028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=remove+pages+from+pdf+edgePDF 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_off0000c8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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