Malicious PDF — malware analysis report

Static analysis result for SHA-256 598f68aad06398a2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 15:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aeb6a79123eef2f85234c0904958d020 SHA-1: 07b3a674f5b3d27ae9d84931735298ecc509823b SHA-256: 598f68aad06398a2dda04e172b67b0e61af2c07126c55de3a9d7aad937cfa12d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary function seems to be acting as a link farm to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://medvor.ru/uplcv?utm_term=free+movies+and+tv+shows+online PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1be55551---78724063520.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e8ee936a3c55d808f5855d6284a4b5b7/67537801405.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/nuzoto.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/gumut.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/reninidosoditewobosusa.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/55648159234.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/88484501418.pdfIn PDF document text
    • https://lapakunited.com/contents/files/41598544781.pdfIn PDF document text
    • http://koddous.com/userfiles/file/xuberojazaxetusilun.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/92020188259.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/61155608276.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/gokag.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/saxiz.pdfIn PDF document text
    • https://kermanrooz.com/img/files/fusom.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/28548091607.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16145b04920d29---28061390913.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474fd54705a---76141654914.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/35285770611.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/46362333193.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/xavipevexixazubaxigizeza.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/46514796084.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/kimubamuraxalexakivisitop.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/83176927563.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148708bafc68---zubazizojuworuvofezutu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b4b6a812bb5e15402f7b8139e1196c56/80136451919.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/pebabetogekaxeligumevi.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_off0000c3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F2 10640 bytes
SHA-256: 5f257d8398a8db41fa59e5aee123f82d1f7ded53a8bfdde62203c271c8e09893
font_01_sfnt_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 17312 bytes
SHA-256: 53fc10edc9b64ffccc780f7dc97d90dcf708651e0bfaadb989821c35710a46a5

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