Malicious PDF — malware analysis report

Static analysis result for SHA-256 753092d64a80ecc8…

MALICIOUS

PDF

59.9 KB Created: 2021-05-25 12:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e97cc00545e3fa0eca5b87c51002128 SHA-1: df33d6450346a07c9ef1894e6e139dd02138e690 SHA-256: 753092d64a80ecc85579ecc176d66c8edaa2423bc6cf0ad91b9615b80c0ceaa8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The embedded URLs are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9559

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://posekatzahradu.cz/files/file/tonolalemijomodevulata.pdf
    • http://botosani.ro/img/uploads/file/kevodukudib.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/511ad6c70c38cd6ad6fe26c5822442d3/29967693305.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6pgf8nv0qha90k2qp4srg2ppg7/wavabutufuzovezugenisel.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/744dee988b9041bd8d7e0d73f096f23a/ririlikotajemap.pdf
    • https://adsbudget.net/userfiles/file/3456146289.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vcec5gtlrpl5ilr6f02b2oom26/zunisotevire.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/u38gi9esnn34unegp382t9c2i3/pukuvovoxekizumojodav.pdf
    • http://botosani.ro/img/uploads/file/mopejem.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a533bf4313b---regawotimomusawujawasusaf.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/dca002d7b4cdd7cca711f58efeeca06d/siledegafo.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3eebea3f5---pamirekolekegiwinepotuju.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ffb1uj9chf1urn43f32ok2o3m3/17866897953.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160853a5455355---jirazetomuludibimaw.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160909f63cdbcc---86402429146.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3bbe0e4c54f0431f8f1f9f13cb8a2150/33155120162.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8d359ac878b30e067272b8c52c52a7cb/66024460833.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098337b33b88---xatabefubibiwekorutetode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=metric+conversion+length+worksheet+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce73.bin
c15f819a9c48df5a9b5b75ea0bcd43d6071a419de7b31029ceb41bdaf7dcb1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 5428 bytes

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