Malicious PDF — malware analysis report

Static analysis result for SHA-256 3512693d48efc507…

MALICIOUS

PDF

84.6 KB Created: 2021-06-12 19:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a1b2b39f97a8166ca20812fd3a6509c8 SHA-1: ce299353613405e61b3afe5dfcdc72be120913a3 SHA-256: 3512693d48efc5078c9e678a1efbfaeaa56dcca0d298c73ceaae6000b3ca42ad
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7802

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 https://allytemp.ru/uplcv?utm_term=sonic+dash+mod+apk+unlimited+red+stars PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/10323d373da786fe45ead8760db6e4f5/65442463520.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b27d5c7c117af103b97cf6a43ef2acff/78179859005.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kaguwimej.pdfIn PDF document text
    • http://rld-carbon.ru/file/18246909870.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/25f40516b83b1e588cd1e1039a27c228/suzemofupapapuruxowugo.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/46107113941.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7bbc9ca20797fe3b7794b3338b8cf42c/32555184729.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/vedaxuxedaxedomoj.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/b6fafa69aec4401684d226d609db717a/vomugiza.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7fdcd78d---5692054381.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9893f13400---29744255499.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8c813b3bd0a0c0f1f229847e44bba6c6/lufejexu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd8b98c10---katuneza.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8dis796vg9pvpgsr8bdut8b8kq/42469806458.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/kosexutaxawugazasep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 5360 bytes
SHA-256: fdad49254967430c9a8f524d3e12ea6030b2e194c8bb28a20c6d103db728821b
font_01_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 13660 bytes
SHA-256: 8db38bf32eaa7e082e0f7a919adf1dea6dff07bfb77c52baf78b349cbeb19bb8

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