Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac533c38ca21be44…

MALICIOUS

PDF

93.7 KB Created: 2021-07-16 04:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d907fc6a29b9264ee0556a6f3116fd95 SHA-1: 81e27ffad964cf890132bfdfc1e3acf80dbeb6f5 SHA-256: ac533c38ca21be444cba5eef02d69d81b7a0158753fc650b228d90c03da66e1d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malicious intent. The presence of multiple links on disposable hosting and the use of UTM parameters indicate a campaign to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2577

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://philabc.ru/uplcv?utm_term=coffee+house+in+connaught+place
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb88fa4d48---75591846370.pdf
    • http://palenice.net/obrazky_clanky/file/bilinosubejumabapedip.pdf
    • https://baptistfriends.org/media/95042352039.pdf
    • http://vervesimuhub.com/userfiles/file/jofajux.pdf
    • https://menu2uplus.com/images/file/vuxixiwepobuwujarufu.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b5357a2c7---kogilufuvoxeretut.pdf
    • http://appletechsolutions.com/userfiles/file/kapekeg.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/dfb785deb19c12af8c84d893ce8a3901/kopewa.pdf
    • http://epoxidice.ro/mm/file/26729988160.pdf
    • https://tepihtrava.rs//files/mumopakolikegobu.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc659b37c7---68245743502.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c03d87035---mowek.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/rumekuzupuzu.pdf
    • http://shipsupply.ru/userfiles/files/vegogulefugagikuwejep.pdf
    • http://piazzademarini3ge.com/userfiles/files/vuwodedeneberikubo.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608534e367d69---bepotoweperit.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e9b1e2783470c7cb6eecb2d09f0ea20f/parabewewegukevurigal.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ljkccl450mbc8g6kdpjdes02nl/gudininuped.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160869594bd0e2---jixewurotudojedepez.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3986a4ff---11093102402.pdf
    • http://france-ex.com/images/blog//file/sofilerovaset.pdf
    • http://greenbrier101.com/userimages/18767910234.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/vozosinalaw.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a5d8b529157fe79139e6ca12cea25fe1/5460011231.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d2d.bin
0f23e8b099e64096720088dbd594d98dd9a58ae836cef6b13112b4ce392abb61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 10788 bytes
font_01_sfnt_off0001360a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1360A 16792 bytes
font_02_sfnt_off00014e1c.bin
76b63c2e2eda8ff5e7216dac60d965db46f40016bc0734d6f6fb4566de2ff4c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1C 17804 bytes

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