Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57c13fcbac957c2…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 17:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f89f986e9968694094008471c39dc5c SHA-1: d90014cc23bf6228783ea27326d8a3efd9fa250e SHA-256: c57c13fcbac957c2d3fbc4a638aa190227d9284ca111096bf3d1690aa9504c8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to compromised websites, likely intended to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe579cd571d60289f6010be511ce74ed/savubuvefenilufosav.pdf In PDF document text
    • http://gibeaufamily.com/clients/870383/File/26256972823.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/dovura.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0cgie0pgqhajl083oitv9as42c/xaxumijopog.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3fa0bf4c3---76247993637.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612a43e07b501---80710135747.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a87d5fe4---romufidi.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/98633422771.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/mfihrgjg8kkq2mc0q7r1rdq4v0/samasomivovuf.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/36166461064.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/dejagepex.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/69396091490.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/40175879929.pdfIn PDF document text
    • https://seerupit.dk/assens/file/pikebalisuseba.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/20736685132.pdfIn PDF document text
    • https://cecprint.com/images/file/95179997224.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb2043bb42---jezalotu.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/57669793027.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9bee83f1b---46425663494.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/23347264722.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/72254410777.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/deluvemogo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a37083eed71---ramorobawizanagugizo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ff8330f6baeee2b70bd2728aae9328c5/88304602998.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/63767219837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+biblia+de+estudio+reina+valera+1960+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_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 21120 bytes
SHA-256: 0e68e5289b0b768a62badf1ec58c29cae09b8d4bf7ad8840a8fb93f75c7c8ca4
font_02_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 11612 bytes
SHA-256: 0be8d7a32fc74f6e3d25b5162a0383effd310d52775d885fdfa00fc2deaca08c

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