Malicious PDF — malware analysis report

Static analysis result for SHA-256 b287785aed148e16…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 23:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4cc135d0c2d40d8c00d71b58b1fddbf SHA-1: d53ea04a403a837351f7aa7b38c3b78e42bb0920 SHA-256: b287785aed148e16c87011a9de271f6f291ff18d87be49d23d7fb128717997c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=list+the+three+layers+of+the+skin PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fcf9af27---kovarijo.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/lisitewovu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f7999a5d4eb---poziniwujo.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/32164151179.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/2108401327.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/disuwumuluxozomajesu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/5168264142.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0ffd8dc275f333e3fc8ef9afd9c39e59/gijovoxanokizinono.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/87104207646.pdfIn PDF document text
    • http://mlight.cz/archiv/file/23789888691.pdfIn PDF document text
    • https://suksesunited.com/contents/files/67161197498.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7vdk29dsb3ofvgptit7gh63si3/tixuserigoxo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dde869a7---pemodovuwimapamipu.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/50540917144.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/48358461377.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d1d2e3d9---rurumixa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/64053270254.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/kalugugoxudisevozil.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9df5c9df---52476958934.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612c317035e81---mojelu.pdfIn PDF document text
    • https://elemonbg.com/Files/File/bedusumisezok.pdfIn PDF document text
    • https://photojet.net/userfiles/file/gufalojusuzorisuv.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/dakesewavujamekavol.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607523ed4638f---pikukaz.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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 15308 bytes
SHA-256: 6c46422f532baa15c86776517b5cdbfc719ae4358673b6588f15e4d23ac08cec
font_01_sfnt_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 10476 bytes
SHA-256: 9fb56f9981b44b094569a7cb461dbe4f62201aae9c7426e397ab0ff2a111f712

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