Malicious PDF — malware analysis report

Static analysis result for SHA-256 540e978f0a2bbb89…

MALICIOUS

PDF

86.4 KB Created: 2021-07-30 10:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7d6f25cfed8ff03d0d8157b6d2a7656 SHA-1: d123b9ff574994af1ecc0f3ab49129bfe652d2af SHA-256: 540e978f0a2bbb89666eecdd8772ff38f8d93fe0b2b43a7334d4d7e6a5f40a4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to manipulate search engine results, likely to direct users to malicious content or phishing pages. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file, with ClamAV identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://delcinfo.ru/img/files/files/91540159849.pdf In PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/3919670809.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cbf62b631f5a40bb8e0eca062a5d6b8f/77018811959.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b1bc49b1d2c0cef3f54b8c79110f91f1/viminez.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8cbde13f4---32927979485.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xogomemasof.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/80451495838.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/vujaguvuvuregozokusobaj.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/24621816067.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/xavijevisakegakenuk.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/86423586381.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/nisiravosawiravazinujaro.pdfIn PDF document text
    • https://eslms.com/userfiles/file/39942203290.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607354db7b6f8---defujuforuvazexuta.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/67799883194.pdfIn PDF document text
    • http://chieucoingason.vn/files/juwojageju.pdfIn PDF document text
    • https://caffedisanto.it/file/98681991853.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/21679543048.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94501d307---pilosimosotuwa.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bc6107c2a6fa3ff6a86cabf23f87093f/vebetapezemesefaxe.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/susipa.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/51871598010.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e3d37dc5---febewufurebap.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af989a76a42---79609685288.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f50b0f1e0---bobagitaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=why+isn%27t+my+nest+thermostat+turning+onPDF 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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17412 bytes
SHA-256: ab308301a689c4d57fc49fc4516e5c506d380e54bab3ff3ccad95096a529ae2d
font_01_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001328c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328C 10748 bytes
SHA-256: 6a5a7e5d2b0313db57875b22431980d834abd482c3c8022dd3dd44c24edac0d1

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