Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa0b3fcd24e814b…

MALICIOUS

PDF

72.1 KB Created: 2021-07-19 20:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90eda78521226ed59e8a6bdeb946b850 SHA-1: 465df98c736ecbe787de2c6e02b80a7861cba4e2 SHA-256: 2aa0b3fcd24e814bad2604c6d083ecf104038652f051d069497be60923770fdb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or spamming campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings indicate a likely attempt to lure users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

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 https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f36fecca97---22170691787.pdf
    • https://vieclamxaydung24h.com/upload/files/12634942501.pdf
    • http://status-go.net/gfx/userfiles/files/sumivefuvafor.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745ea7ad3fd---95815704692.pdf
    • http://31kouqiang.com/userfiles/file/1625244396.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/30187222165.pdf
    • http://naszymsladem.pl/upload/file/24694065363.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/sejipilomekotem.pdf
    • http://greatnice.club/updatefiles/file/86073499898.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/73971077259.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18e17dd9f---nabuzi.pdf
    • http://easyreturn.store/userfiles/file/57377200536.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb7a9f326---petoxesitamezu.pdf
    • http://jrmhandling.nl/upload/file/4756016487.pdf
    • http://antwerp-reefer-tournament.be/argt/files/kiratinonesusumodopimeba.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5cbc7fbbb---67559449262.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/jixipomitipozinanujaniba.pdf
    • http://agroanaliz.by/upload/editor/files/kafib.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/48586856c13bfe6cd8cab62493ce75a7/37882017182.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2ab69746---54293967846.pdf
    • https://krassimirtaskov.com/userfiles/files/tofilunuxud.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793757dca0d---lowunepakevunogebulez.pdf
    • http://cokhihoaiduc.com/uploads/files/fozeluzisonupaw.pdf
    • http://hkacca.com/userfiles/30298849491.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b43cb452---94563657850.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=emily+name+meaning
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f058.bin
e038a52f0838910e2feeaee0d752a41aa04fb0339734927ee71375919ee9750c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 18356 bytes

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