Malicious PDF — malware analysis report

Static analysis result for SHA-256 be96d4b0ffe1be24…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 23:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 002e1ce95beb741ae42ec5a68cb97e6d SHA-1: d2bca99432d819b324604002b2380434060d86ca SHA-256: be96d4b0ffe1be24781cd2d1880e47a68c9f1c672c92bc172024857f964e0dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=prolonged+hiccups+in+babies PDF link annotation
    • https://biovuspharma.net/userfiles/files/71278807049.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9ef96914---bazigezovisesiwekefip.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/1474705759.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/gfbaamrt85nvjblt2hr4ainc10/20171978461.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/nusapofozorera.pdfIn PDF document text
    • https://brod-plovdiv.com/images/71356587443.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zarakolibetivejejinoze.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/77676070938.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/vezumirizokiwe.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/sitowabaluwazopuv.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xinegogexozivifefut.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/33935278838.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/75733789805.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vavkqabrcqicb9lue89qjahdbo/63145569731.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/digemubosovajeruwegekum.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/luxupilebebeji.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d98c30e3a1fefee1ab525bd9768f31d1/faruxamotigefebanazikefe.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110b6434a77b---2764163736.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e9b927cbd170c726fcd5254966949bf6/tazapawepage.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7773c9c087---94011801949.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/76143073389.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/00433a62a558dac78715d17340cd2797/67317666854.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_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 10936 bytes
SHA-256: bb04442f46c38a6f31e4b34cdf33c17ae4d5c3414315dac7622ed38fe67dcac0
font_01_sfnt_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 16900 bytes
SHA-256: 8288b30bbcc7ea11dcfc131b6051bd2a4885fc73f549bc98d4bac66e3e927dd0

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