Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cf9eaf8736e53f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 03:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3674df5f81e095780f034430f2d30619 SHA-1: 53d514bd4d23ddbb79a53cbcef906589dc556abb SHA-256: 92cf9eaf8736e53f688e44c463ef38dc45205f11ef32e223057a1c0517fee868
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=sunehri+lomdi+watch+online PDF link annotation
    • https://chorland-dining.com/webroot/editor-uploads/files/32675750971.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/21514157745.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/10425449083.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/raturu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcf74834b---32307168179.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/76777737857.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/87195438021.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dalavav.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314242be21d---soluwinuzujem.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/kapuxigikikivuv.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/68649099822.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/zenibuzev.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f17170e9---41475594564.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/74404910753.pdfIn PDF document text
    • http://thedreams.cz/files/6890798016.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/badotoj.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904012333.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/memademavivekeru.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/muligotelufur.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/87486423745.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/10352161014.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210903003850_rf0cxr.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/jurozovipimudexowekuvu.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_off0000b4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E4 17772 bytes
SHA-256: fb9ecacad26c5d3af936ee55b2509451738b4586368968c45a1e943df512c0d5
font_01_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 10728 bytes
SHA-256: e6a0a55f42787f8d8c7c7cc1595b1ecb0f35a22dbd3c59e3ac09a70d88d97da8
font_02_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1