Malicious PDF — malware analysis report

Static analysis result for SHA-256 185d58f572822750…

MALICIOUS

PDF

72.2 KB Created: 2021-05-13 07:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72853f7511bb6e2e9fae4533abcb3999 SHA-1: 895b0b1d43bda6aaf3bc517d3c2633a41f2c3491 SHA-256: 185d58f572822750f1046713a4b2c6445ef079d3174880f9d6cb11d4e9877060
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9683

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://smidgel.ru/uplcv?utm_term=optex+vxi-+am+pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4cq4tjelvq7437p9l7s4l7c46p/wetetamebemabanuxegen.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3c6c35ad---29885564566.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099142c69aea---12021623674.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf73866d2---63237503099.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7af284bedd6fc9ca35f661cb212df906/97212246152.pdf
    • http://abacusnancy.com/userfiles/file/84404049002.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/618r4le9usua7ghghm15u1lcqs/xokom.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9h1vgpk47h7o5nnsh3knsmgmh/nifazufeno.pdf
    • http://accessiblevehicleservices.com/userfiles/file/4128264826.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/8726eaa57d5b757b9b26316fa4fd7ff6/95212424222.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080369b926c9---rafagafoxedabazejezi.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904d0840c1e---90185529991.pdf
    • http://vogiantinhmach.com/media/ftp/file/peluzemuvofeluz.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4422dd1ed60385cd1cc64f0982d58f8b/38532641895.pdf
    • http://amuseonline.com/absite/userfiles/file/17242335385.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c48dbe9af4---ranotuparumorun.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8e43e21df72c3b298d525ec16881b2df/tiwinobodimodu.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2c25367aec9b8b866d116295a9c756bb/sefidozuviwakarubutuxig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e278.bin
5ddeb4838f294c2eaf58fa76cdc6e491d169ca28c6e493340d2e51ed7d7c1ed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 5068 bytes
font_01_sfnt_off0000f3ba.bin
551d6e158c41a19fc265b62f52c34fc1f48cfaf5e1207b22b85ff5195ea4b4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 14680 bytes

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