Malicious PDF — malware analysis report

Static analysis result for SHA-256 006ab2bdd14cffea…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 00:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dea52c45a50a9a57b87642302e73a070 SHA-1: fa95077235d25e3b438c91e66d20e53c897c8ed6 SHA-256: 006ab2bdd14cffea784cfa7e3fa20e5da33d2de8ca780d3df07e41e50c4f2327
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=etika+bisnis+k+bertens+pdf PDF link annotation
    • http://www.dilipprabhavalkar.com/images/file/zidosurijupesemuxaxawu.pdfIn PDF document text
    • http://abwessex.com/uploads/files/piwunexisexubapiva.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/batemada.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/lanovak.pdfIn PDF document text
    • http://seamacros.com/upload/file/89762722274.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/56890808197.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072871751410---50398372769.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7237546263c51d6ff683e981aa1c0675/82842630381.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e18071377---wirozuraw.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/98013374612.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/30143907648.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/vizorotujoverisuxodug.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/mobaj.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aa944d2b39b6f8044158c5fb1b04b49d/gokeziv.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/6102098627.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed15feab1c---14028014064.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/4086090631.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fac9e2c074b---gunemow.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/148801953160a5bff5f3668.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/26489757148.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c99b67094---tibibejoguwef.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e5706324c---86290599622.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/duvexotit.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebd88b462---wuvirelifedobu.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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 10540 bytes
SHA-256: 3b050aa9c2b37b97734e290c2921e4319fe28278d50dc3fe4dfb340512c84cc2
font_01_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 17944 bytes
SHA-256: 0b2d91695acf3a00473bb6ae9a5445049b46efa38f4f443a53249d0726341038
font_02_sfnt_off00011907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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