Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5c598521f3b124…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 22:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cb1271bc3bfea00f7c13570f24121dc SHA-1: a3227cb1a9fa64659098cc13f5847d9d49744b0b SHA-256: ba5c598521f3b12411eed8befa77b1ff8d0f0dc52d3515228450f30950dcac27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that this document is designed to host a large number of links, likely for phishing or to distribute further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7162

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://laborke.ru/uplcv?utm_term=citizen+promaster+diver+200m+manual
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae7a0f1729a94675268fe5e901700029/1066240190.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/sajaritubizopuxeponufa.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c417a464201---52994411289.pdf
    • http://greenmodels.ru/uploads/files/vufoxometefak.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/jugomavipowasukadipalexi.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/9h312i40ojebcs59ir5nfvdmpc/62182145975.pdf
    • http://lnaixi.com/userfiles/file/20210717154906_1594686640.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a965031b1d982f6aec3588f5ffb71255/zelodaseberuvusuvi.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/4044806993.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815972a732b---83550228657.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tl7m1a7s8asq10a28rqrg9gde7/ruparab.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5546b5aeb627703622d5f3a3a3258f4c/patovisuk.pdf
    • http://boschvietnam.com/files/usersfiles/files/nenafoxakubu.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/nekotudidixegevob.pdf
    • https://guineaservicesproviders.com/gsp/files/55821128102.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c5n12g154n8eoec0olc686ki52/20354782385.pdf
    • https://pasarangroup1.com/contents/files/64703661991.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1afae48223---mikunati.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce326f341a---54291539243.pdf
    • http://blackhorsesc.pl/userfiles/file/24287442473.pdf
    • http://builderall.info/userfiles/file/bulivokalujefogojitebeva.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e2c625b0f8cd8263906b7b187791955c/mawadafe.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1ef30e23a3f9859def3ded30fbf33f9f/89725608430.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5cebff4sqfkluaaaqb400uq901/39198154544.pdf
    • https://holocaustresearch.pl/nowy/photo/file/86236130356.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e285.bin
fb64323bc82c2c3b6435b78da1d58bd33a07c0344e2401316b88e292a641c21b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 18656 bytes
font_01_sfnt_off000113a6.bin
fb22bc1eb0d8f944fe78e1365672f6a2641a73d2f2d8596a5d1eec7bed3c6c5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 11052 bytes