Malicious PDF — malware analysis report

Static analysis result for SHA-256 566bfe36a921d32d…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 17:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c67beca4262a9d81e60bd40bc79ea7e9 SHA-1: 71f0a9400fd4623d5a4a181c2109fa279e40148b SHA-256: 566bfe36a921d32d8d020dd18261f7ed3adf3e49bafb50cfd0b0998b4107060b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://campcolefamilyreunion.com/clients/82065/File/pikuxesufutupetuxilexik.pdf In PDF document text
    • https://theatresaucinema.fr/uploads/file/24057670162.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/817cbb003c67fa7bd132ce41700233b9/mejolufejajubekobob.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/16742166246.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/75966542137.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/47457075381.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/suvoxawawuzivap.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/74823300726.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/94294534452.pdfIn PDF document text
    • https://rm-parketi.si/uploads/66874223942.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160960f92ab861---kugav.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/wixivek.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/sexozapur.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/temobubowajikidibipik.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/85540659842.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/bolixonavagezorux.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/rizajapo.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/49048041415.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/36d6e5ac1e1a42efd536bd6f3f872fa3/dumirotasazokikegudirot.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/48860734911.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ba56722b---tofexovinarazuzopetofizas.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e0d4f765---83601450529.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609231ea3b6bc---786757580.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/lojesevajejizorazew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=competition+and+consumer+act+2010+%28cth%29+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_off0000c412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC412 17156 bytes
SHA-256: 3a3612acce5848e6b99488c2473ffa53f89151341591532a8093336ab4006cc9
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 11420 bytes
SHA-256: ddf036e4730c396678037599e414a6f935bb16df9a4a59d3a364be6ac9c20b5f
font_02_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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