Malicious PDF — malware analysis report

Static analysis result for SHA-256 211b677aac374ea2…

MALICIOUS

PDF

62.3 KB Created: 2021-09-03 07:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 395b531095d623dd1ba7cc1b0a547592 SHA-1: a4b7935a8f60729dd9242775e33ba28536d9c37e SHA-256: 211b677aac374ea2aeb29234da280cc369cffc4f91a88947ecdeb5c430be49d1
154 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be hosted on compromised CMS uploads or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9427

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dailyliving.nl/ckfinder/userfiles/files/tonajesotapage.pdf In PDF document text
    • http://archifolder.com/userfiles/files/88261243358.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ed15b87b0---rogudidozolopapuf.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/5c943c9d77418160e83ceb6f3bf4d492/fifunaxafadezagiwikapofon.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/26027188520.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ecebc5303393fbfe8cb97f0ca501141b/movug.pdfIn PDF document text
    • https://banghenails.com/upload/file/37637262978.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/db85seeo5s1g16j3ab1121dp0l/32995579627.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7ed15dda---filojif.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/7855334681.pdfIn PDF document text
    • https://shidoremicrosys.com/media/padenovene.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/nakokimal.pdfIn PDF document text
    • https://digireg.ru/upload/nimijonipedelub.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc53612b2---15343680951.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/59200421708.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/haq17eskria3vvmsglji5pbp27/26039961361.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/11193042270.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/bufitaripibelagavot.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/fd2ead129a98039d728def52e422a707/10301407955.pdfIn PDF document text
    • https://grouptm2.com/contents/files/9724110753.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/3405854267.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c95fe937a---godijorotanerof.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/33801424400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=electromagnetic+compatibility+handbook+kenneth+l.+kaiser+pdfPDF 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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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