Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87826cef2602c7f…

MALICIOUS

PDF

194.1 KB Created: 2021-09-04 13:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b12cdba406af769ff21de409a4c1996c SHA-1: 52b225970a4cea1841cd6825b7513489b8a7b51a SHA-256: a87826cef2602c7fabbd2835a71ea6ff7567d7599aae3973af92e2ea2fd607ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to compromised WordPress sites or disposable hosting domains. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://supair-lux.hu/ckfinder/userfiles/files/58614541098.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd8eaa37a---dopixu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hcjfop134tsugs4v8f8hu52nv7/55101650871.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f64bf00d30b2abc1468df0d183719d27/panusasodivokalif.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/wixaxofumijev.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/zonowegoregibo.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/26462893209.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0598b23c313de2d845f188c970fadb54/wimemagunonifokexikafup.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0bcc38625---32181758505.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/kegusapokijekikixe.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/gexozinasovanofulafakow.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/382fef88846a41c9dba43ccf79db1463/lavibufuvojuwozesitajev.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/2165593037.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/96280939520.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/226868caa24e82e96d551df5eaf93ac9/83360207215.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vejomexilowovabimokadaw.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/lodisokiwurobubibo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc614248b---38650094452.pdfIn PDF document text
    • https://designclarf.it/file/kekawoberixafitutakebow.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/xagujobofimuwupesuvu.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1e4f0748bc2933e685bab824602b4bd2/71173467234.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/68061293794.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/kowuriviriloputiwoxar.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/rutekaxevozafetajufurag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=resumo+hermeneutica+juridica+pdfPDF 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_off00028d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D2A 22680 bytes
SHA-256: a5146d70fa790f22b3edb49e5f615523eeb73dccc32a8816d4f03695b22400a0
font_01_sfnt_off0002c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C810 11112 bytes
SHA-256: 4fb23c32871f1392a8a3ab7da6b11cf1ba0883ec1f631f2fb9d10ee5b3030073
font_02_sfnt_off0002e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1