Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a89ee529e7f7f9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 13:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 814ebffd787a1ae7d089b1c9a3fd7407 SHA-1: 286445fa159da46dfea0df9fe177a72075e2cee1 SHA-256: c6a89ee529e7f7f96eb03f05936d40fe8206e49e0b1b19c4ac328e88a92f0dc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. The presence of these links suggests the primary goal is to direct users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://champaigncursillo.com/userfiles/file/12541852826.pdf In PDF document text
    • http://dfh-consulting.com/userfiles/file/86017827874.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f649b42c82d---72271129439.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/85456664294.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/kadufedo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e078f4e91c45bc33bdef02a174d3dca6/tomisegugajamizoja.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/11160659751.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/62105323675.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/75291100770.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/zebozoxe.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/152d9387f36d263d83ac1ea29557d62d/duzomozaj.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/our5hiiumt18hkb2d03qtitlu0/41412833161.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/giboxoriluxeguvisavoda.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0ac7954a86eb9007f06225e80d35a38c/26405330905.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/da18329e894e20c674036735bfa4e2b1/89756781901.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d4de668b089444a548d4150e875c5bc4/91446303379.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/domozesakojuzefega.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/93797934613.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/13757239035.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ginubiveb.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/64288961566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sand+key+park+clearwaterPDF 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_off0000ceaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 18756 bytes
SHA-256: 6025611cc675e8c3f613ac31979b09dbb99d6b56f38354f33994264bc088ed18
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 10492 bytes
SHA-256: 4bdeacef75ef2b5995c78be0633f477b237eea2880b2259a9403cd998c0f0817

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