Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86e8ad93db93406…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 10:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 65dbed1fb6058967d7219c2d7cf96abd SHA-1: bf2ce4c82b091d1487c5e66f2117ac929a9f742f SHA-256: e86e8ad93db93406d54d5ef9709fe74dd8c34ea2f3b5af9b7048208336c6abb8
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised infrastructure. This suggests an attempt to direct users to malicious websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6770

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://propertiesforrent.com/userfiles/file///94805599626.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2cfc3403e5386aa44c14b5e30890dd2b/79681541679.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/2916145242.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202182192487736.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/16609150394.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081a930f10c1---7736998218.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/mubupubomofapebifuk.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/23102939555.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/01daec6b852b18d380e96164fd7154b0/xesofifibilebese.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4ee16c6b---tufodavip.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/80111002301.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160830b351d21e---45155319663.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/20484788947.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/28955177880.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kazos.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/9bb295141f3ca7a39e9ab308e8bdbbd7/mekipifezidebamoxaw.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fne9rv25c0gi962fpubbmdmol4/kiwufud.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ea642bdc---79728808679.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7a139625---rozokebigunabomubamin.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/xigus.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/31416803222.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/50772329418.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/desijinowufomazekun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=volume+of+prisms+and+cylinders+worksheet+math+aidsPDF 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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 17524 bytes
SHA-256: 458c2287f62569c6361e2389bf7f70e31485394b9790c4a56888262905cd1330

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