Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb66cc6b619b2c77…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 09:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 675c71141003b0efd8884d977e084b2a SHA-1: 0edb9bb523efb700bda6e8ac7db8303a96693efe SHA-256: eb66cc6b619b2c777de354cf8e868dcb30e854358a1c80c7d539022e047d6974
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious actions within a PDF.

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://philabc.ru/uplcv?utm_term=hand+bone+parts+name PDF link annotation
    • http://wsystem.sk/userfiles/files/78903179303.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2647b527---56825760267.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/4887789856.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/93438017175.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/nezomolusuru.pdfIn PDF document text
    • https://il-gusto.com/images/file/81244038649.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/29544131212.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/xikebomigavisabanerituvel.pdfIn PDF document text
    • http://carbonelite.ru/file/lewarideriluguguredotub.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b427bd425518fe96fa19cb05ef289edb/31632931349.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161412abbbe886---59762937354.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/25e94ffe3bf1de7845cddf167249173c/sodivasajizefowokaradi.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210919181836.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/fozaku.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/wisonugataliwopu.pdfIn PDF document text
    • http://lg-palette.com/upload/files/47438921637.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/kagesesejujatakavudixu.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/bapiwegegiwuzififilef.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/nevokofan.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6fb7b0c7ad0a3ce2d9ca3c95d59622b6/64387660067.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161497d5ad1206---49017143213.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/wikatufezaxa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a668ea090a---bejepujasirida.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/63779806651.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/36848063140.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_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 17832 bytes
SHA-256: c95241bdb1b9ccbc82bd8e335bcefe75398cb8fa6d3e51fd27a5ed4aec386490
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 10548 bytes
SHA-256: 093c20ae644d77e7ccd9e5e07a805e9e286d61077ec53312c11e732226d0ac38
font_02_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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