Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e4208ce095e03f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 21:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48796d4638ab08029b2c58fe75c496b6 SHA-1: a4967116d0b049b185920caa3268730f153d53a7 SHA-256: 99e4208ce095e03f7fe739cd6d4098345dbe08c332216c160282019c9c3be197
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=install+wkhtmltopdf+in+ubuntu+18.04 PDF link annotation
    • http://ankaser.com/userfiles/file/66029412512.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/58916046921.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080462a72051---jugagezonotafed.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/27144126981.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/gasagaru.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/makis.pdfIn PDF document text
    • http://arslanemlak.come/file/vomomeruputatite.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7a0b69e95---62606400494.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f553dfa6a---gisida.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///91046525573.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/dixolowujivuwemegem.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/mokorelet.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a06de9b2ce6---2356717107.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/33848746784.pdfIn PDF document text
    • http://vejwun.cz/images/bezesojilaxivuvuwemepag.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vei03mcpbe7q2u54rfg1lqg333/joredugoravu.pdfIn PDF document text
    • https://businesslife.com/content/files/robijepikomupepevumajala.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/fevitofilenenafeku.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/namas.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/83095002770.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/49033358154.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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 11428 bytes
SHA-256: c6912adf3eeae312c8247ce6b076ddc07aebf39dd0f151d025bb04d37ed2bfb0
font_02_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 18392 bytes
SHA-256: b15ca7aeb078465a13f217682fd4b8e579ffdf4178cc8fb5d61f0cdbeb7fb629

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