Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86eef70d3bc56c5…

MALICIOUS

PDF

80.8 KB Created: 2021-08-26 11:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae5c1da19af11dec970dbf6f42fe1aaa SHA-1: 4cd43635ee705ffbf2d59546d200f6af71d9cd23 SHA-256: f86eef70d3bc56c5f3d35ce3625bd851410a4599266cc64092194fff512d2387
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.smakbyala.com/ckfinder/userfiles/files/pibok.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd284128e---bupujepujilipus.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/44411551844.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/92494343514.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/98569728677.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/nonepexamusunuse.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/75863745527.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/vusuraligulox.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110fb04aa7a5---14849092120.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1726e753---6384161223.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071984583806---sarevunap.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056efbebeb---57111684697.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e3c1acd7dfb56a4a092a1591f083926/37018497033.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4c349059aa3a640e8eae64d0e83251cd/dugola.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1ae9a5ac2aca08b29bc36ba4801c1091/4443195756.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/45316360568.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210817174301.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/7eaed08ed21b1f5655cdc377965fc4c8/79858632649.pdfIn PDF document text
    • http://apsons.eu/files/file/safidoxemanujezetepitege.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/lipuwedesuponajot.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/sozatifobotedut.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210821154530166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=example+of+letter+of+agreement+between+two+partiesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 11012 bytes
SHA-256: a17fc1cfc0c59eaac5407a5d0f876853a21972276806a738e1e5d08deb944b3a
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 16644 bytes
SHA-256: d40934f3e469287b5dbebdbf87a6d99c0d6f5bd5066d675024bc151d2b770166
font_02_sfnt_off00011b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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