Malicious PDF — malware analysis report

Static analysis result for SHA-256 6669e36a372222bb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 07:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6290f14263f48e1f25e59ef122890956 SHA-1: 817310d3c1d471aaa16a51d82f7ff851bdd72bf5 SHA-256: 6669e36a372222bbe22001a67959e9b170fb8b727f2f4225f62818fba7dd1dfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=fast+racing+3d+mod PDF link annotation
    • http://ubytovani-budejovice.cz/picture/vtextu/file/nulofusez.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/wijajajadosazeviseso.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/79rqbl69q15i6qnqk9rjinc7i8/89392230538.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/16899370960.pdfIn PDF document text
    • https://12shio2.com/contents/files/serujefu.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/4018036921.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d94ee03a8---46004428595.pdfIn PDF document text
    • https://venus-forever.com/image/files/kitetab.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/tivowonaros.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/140211467856.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/gelotivet.pdfIn PDF document text
    • https://rajaunited.com/contents/files/bufigefafaropuga.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce278ad773---vibobemalomitagozizos.pdfIn PDF document text
    • http://neuroxl.com/images/file/ripurobileweda.pdfIn PDF document text
    • https://biocoils.com/img/file/31183164638.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/64768823405.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zodam.pdfIn PDF document text
    • http://ty-int.com/files/files/16546249367.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/10447924293.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/zidisibasegebiwuxa.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/80689171829.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/77714988551.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/19214820589.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/xevexidobawipitobudoseza.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/395033374.pdfIn PDF document text
    • 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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 10684 bytes
SHA-256: a52c55c5d73fbf0e7c7ce4f7443990c350026044c1115841390930712cc33570
font_02_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 18076 bytes
SHA-256: 68db7b0289f2e112c575d3ff5e70ccef5e2aa07fd2b4f49211fcfe7833a83d37

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