Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebef0cced35e8c10…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 05:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df1d247dcf8813f9bef0ad94d5ac736d SHA-1: df8be0c18ddcfef5698144dfdd6f931994079257 SHA-256: ebef0cced35e8c1024837d54a574f481ffffcb5eff35602d28ced8a5fb494030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to potentially compromised websites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/vewibagefarekopexaw.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/deflltomsbnl6jnncqdhrq35b2/93373631057.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607870a579b86---jenatekutorazujujuxatugi.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/63836360442.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124a46fdecb8---zibiwopilisesikito.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1e685c6bf---94704889915.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b046111380---xejalopibusikubupoviruloz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ntu69e9d3d22fb3s7ehr2so2v5/4612736710.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/58568649854.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/55995936121.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/zedokubetuka.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/65c2d2a0f81d6040860dae95bd3c01dd/37872888481.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/19d4d5dd5ced95c5e4e6832db5cccad1/39469000121.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/norukajupasuk.pdfIn PDF document text
    • http://rafaelokazakov.com/file/45273346576.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/72906631729.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bce8c8e8169---25537188992.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d704a2b51b---80253292426.pdfIn PDF document text
    • http://ozari-ua.com/files/file/razevabiva.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/54800777285.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210810182419_8guwsg.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/wegedotiv.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c969015def---82876003298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=quadratic+functions+graph+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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 10880 bytes
SHA-256: 67ae038cf98da79c8c90ece6069dfb902b05645998ad43203c6f2e04c4d9296e
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 19032 bytes
SHA-256: 3b6795795db32cce8098116565ca6fd6008ab8b3529b0a56b381885e50a114d5
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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