Malicious PDF — malware analysis report

Static analysis result for SHA-256 718544f84ea66322…

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 15:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad0f1d676335dd9b3bfa4bf2ed54374d SHA-1: 7a8f34b092d638c092c943cde00bc2d1bc13fe63 SHA-256: 718544f84ea66322574533ebb3ddb3ade59e08071a5496c8c77fa0465685ad77
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb4d5b5595---34736556645.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/7544917babfa50f9094720d65925eaec/55933923738.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/46097761729.pdf
    • https://ancoraeducacion.com/images/62812839081.pdf
    • https://accuratesearch.com/userfiles/file/topibatudaguligatatap.pdf
    • http://sns.hu/_user/file/kevumatutugosavesajuw.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/305g0pu3sb33sjqfnqj05ta7o9/33393910320.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160884e914cbff---bogerilovawogig.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077c85e50280---zuzabizopamati.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b4eff3380486a5a2a17510ebf1a8403e/54358524884.pdf
    • https://aldurra.ly/images-editeur/img/file/notavibuxojexejubefa.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bf5b4ec6c---67409112747.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6c2aab7e---zeladumar.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3973e94e9383a7dc76534d529660ee72/ziwuvuzeponorewedixu.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/kevenunomelejiriveki.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/walovufesutenelefejepez.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f713f48378---96344183550.pdf
    • http://zrdb-drogbud.pl/Upload/file/13252484357.pdf
    • http://gyobel.itpublic/file/tiwovepivuwezesawod.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c554369e---65564089571.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/59dc14314d9fb044fb337ada46f864b8/pomuwikevajakavedobavoton.pdf
    • http://ck-tct.ru/userfiles/file/lunareridadonutelezuta.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/595d25444134acdd09dd4c0c5a78f56b/73506536869.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6bt66pk65ed3gkm2qcpfns4dgs/72273922372.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+four+air+masses
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off00010718.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 16792 bytes
font_01_sfnt_off00011f2f.bin
afe0e741bcebaf65e6c88fb98b746c282b97c3521ac7a380603c7dddc0637c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 10292 bytes
font_02_sfnt_off0001365d.bin
7bea1aad8adeaa9941c9efad35d73a4be05aeb306c5ae354bdbfc37d79251b6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1365D 17240 bytes