Malicious PDF — malware analysis report

Static analysis result for SHA-256 9457dad98143b432…

MALICIOUS

PDF

73.4 KB Created: 2021-07-04 18:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1812ee7b52b66aa8b05190e4766dea23 SHA-1: 77a61f36c49606528034f448291900e06019e154 SHA-256: 9457dad98143b432e819fa22dd7faef90d5a824dd41ca3da7a926465d494b585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment, pointing towards a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=baby+4+month+vaccines PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/nobut.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/15545245933.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbcc7df34---nopisajenuzinajimokow.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/fotasixerebukokixat.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5d05bc236efc9e90f26ae3cbee269f07/ravawamumanomukexodapa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5eluccclkkkg3ujs54pghe6tc3/lojitigonife.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af8fe4c5d6b---65849940548.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/guvovivonafebemomeduw.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/22835126959.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/zubirisisore.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/91156607652.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e305d6f90---42852254128.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/zajasesowan.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/514ac590f152f63ba4f07fc5fc204af6/fegekemenezonejuz.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec0b92602f---mofigozinani.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9256a310c8aeaa79c79708963a56ae54/bizefatusuduxawulobopapuv.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d65292f0f9---zomuji.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfe1f0887---tuxiremipisadepin.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c73fb062135---6094826266.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/999db81b94092ba84cfbcc78c299e689/15332076567.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/jutugatazomiza.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/srtujorugka5ebej6o2vmpfvtb/21778914975.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_off0000bf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 15792 bytes
SHA-256: db19dde8d3432b0281e119e318401202ae39f0d6140a33afd6e4e3923fd99c6a
font_02_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 10800 bytes
SHA-256: 2f8d7700a59c91b4c68926323c39e1fae796113f17d4c681f471445de469d658

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