Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6c6eef5919c34e…

MALICIOUS

PDF

87.5 KB Created: 2021-07-13 22:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66889f8d3f21cbcfaa20a0f8606dcecc SHA-1: 572aea472dc0ce90f641a8b9dbb6603ee556c28c SHA-256: 1d6c6eef5919c34e89fe02e2f91432828d349d37c0f4acae8c431f8a5c6f639a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3f8cd6ca56aca25f070316373f9bf4e3/nolapemuroxig.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab929da354---dazirog.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dbd76981---rivopitase.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/33dqi9lv7lcq10eu25s409dvb1/49106829540.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/3470071752.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0981f4ed---54198293791.pdf
    • https://silga.ca/userfiles/file/36246093348.pdf
    • https://kajariaadsevents.com/admin/uploads/file/dixoxixaxobuzazowigoru.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/danutuwotaferox.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f15805a9---pudalafuwafe.pdf
    • http://security-m.jp/tool/images/file/98386218684.pdf
    • http://ahkkpcm.org/userfiles/71412195611.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/r5eh5jbpj4rpol6gt3achp6kof/vowetab.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/61c05jk8nllb6l8c6rs6t0hl5c/zudosarovubitizokorus.pdf
    • https://gea99.com/ckfinder/userfiles/files/78646022202.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bca2cb5c2ad---dudolitimunivisemudul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=southern+northern+western+eastern+blotting
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f327.bin
21ca9b040d19108c7b4d1f4f55fa9b3421c05862ee3c823116581ab5c3c07722		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 16692 bytes
font_01_sfnt_off00011e9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 16792 bytes
font_02_sfnt_off000136b6.bin
525bd32203504c9d2c7830cb341b7d2e93d4d3424386342a0457d3dd81e309f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136B6 10788 bytes

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