Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9f5c2de688814f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 14:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94a0b30e4d86d5ffe8c5cbb31b9bc781 SHA-1: add1934af7cd981d8f412ed5262582213aa0c015 SHA-256: 5e9f5c2de688814f04d2204b41064d999c0019f9296128e1a942e4e2c4217304
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of JavaScript and numerous external links indicates a likely intent to download further payloads or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce54d4ebe8---foteso.pdf In PDF document text
    • http://realfootball.gr/userfiles/file/1968575799.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ve943rc74622mbhnq5qdaol397/buxofa.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/56847918950.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/33977516027.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2a1ed01e---42989507034.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/rabutenidisega.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/watusuropupizasifafimigu.pdfIn PDF document text
    • http://fkhd.cz/data/img/2871867645.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/37225906769.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/kgip08jgm0pduarelk3n9e8bcr/ligadineripilodimevog.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/sadunegudafo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135734259163---puverexatono.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210908_3D456E008C588E60.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/75078947082.pdfIn PDF document text
    • http://snsi.jp/image/news_file/58928336510.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/pefosalazogopik.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/271940695.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/52154120721.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/pejuwuwitipisop.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210905_F73CD38178A62912.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7ne482provohoe3s9ohi2q71vb/poxaboxukavomapovegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=put+linux+on+android+tabletPDF link annotation
    • 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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 17616 bytes
SHA-256: 169b1ef57daf4a264b452b36810c172caccf6f76add2d17c1b96a97939c21c56
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 10416 bytes
SHA-256: 1afac47a26fb8c041f55949f3d6c9c7b6626b8f65f39b40283fc9258f5b18d89
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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