Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bbfa1a3706fda3…

MALICIOUS

PDF

80.0 KB Created: 2021-08-05 05:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01f22ae52f0a4e27a6ee9e6afdfb3965 SHA-1: 6f79ff23dab65aa1edd82d06a15e60603ff74e16 SHA-256: 40bbfa1a3706fda3ac5e3b194a510780bbfa466331db10138fce95e250eeb17f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. This structure suggests a link farm designed to redirect users to potentially malicious content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving social engineering to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4964

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://cuatro-pr.org/sites/default/files/file/gubifunuvaxetezevobajup.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8ed93bc903102f2f2d430ab19bffa038/94380578717.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b93892bf3bd3d975c3b427d871188091/12253947386.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087636b2561f---54982923707.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/selemofetafiridepiluxile.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/venesadifetofa.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/sodufevizapanomewejutasi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a67aebd4ff3d41ce549cfba4fa175756/7156969145.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/388uph7rm1027br8vs5h5hce7i/67955639669.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/jozusuwuzuvu.pdfIn PDF document text
    • http://qwerty.pl/_data/file/7243212626.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/wegimimegataf.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba21d558c2---rodojijopovexu.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/bevejajepom.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9287033e8---degazadedosaxixinezefa.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/16314166135.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/zoxaxazuno.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/79np818eggojv2vovpnb7d6v8p/jidigotetubamibibawepun.pdfIn PDF document text
    • https://anaksemut.com/contents//files/86029678343.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e5553cdd---kajarotun.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/odjpgrgbq5uuk1060eiivvggsh/vikupugokulosa.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/42342169718.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1c9736035---35735063508.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608053deb973b---1822803153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+blur+background+in+zoom+appPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 17388 bytes
SHA-256: bb2f9e6296da166611ebf601dd0ebef317bc11e37591712eb3222ef1efd13aa0
font_01_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1