Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c62ab3a8cf801f…

MALICIOUS

PDF

61.1 KB Created: 2021-06-05 01:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1c4e72268686a3b6ccdd940f9d57841 SHA-1: 2ef16d9c09e38acdb05020032bbeb43af910bcd3 SHA-256: a2c62ab3a8cf801fa7f9d7dd0e73ca8edb88dd541fc16c781088f251e42a9cd6
154 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous URLs and the heuristic findings point towards the document serving as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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=les+inconv%25C3%25A9nients+du+t%25C3%25A9l%25C3%25A9phone+portable+pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/73843d3359cd2a7e6618dd837305983f/35136981906.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607448d3a921f---58971055823.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079da3fa42---narefew.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4d1ffb5bdbeda69cda0e810a51366b48/mexarixemigobarurukomoga.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecef9593f---vazovajejatusediluv.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/sb5tbe9hd6i05j9d1r2dnoegjm/30934185561.pdf
    • https://stratasphere.online/userfiles/file/pitawajifuduwuvemi.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/19247699948.pdf
    • http://ahchala.com/img/file/pofabutilewagubuvi.pdf
    • https://loyallcanada.ca/editor_files/file/rexofugojon.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc4ed2ffe---49334958604.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160894351a7c3c---6680643444.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b672a030969---nunenano.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098455123679---47897237311.pdf
    • https://mmszke.hu/files/file/jedibukatuxesobowesebosiz.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jhsj9ubs82hcfrgfnkblff0st5/11309943432.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12f.bin
95e40f22c41a8d430b4e7c762b707b66577bd0aae0b6ca0d6a9ce3575784f1c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 5408 bytes

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