Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab511cfb23bcd15…

MALICIOUS

PDF

79.4 KB Created: 2021-08-27 20:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a7e50f91d93ff83c872c901ca3f6b592 SHA-1: 8d3c4e061c192ff7c03ca3aede7d4efda8aa3bb7 SHA-256: 4ab511cfb23bcd15d817ae58fb070e672207ee0a447479e720421754ee7efd91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zpb-maciejewski.pl/upload/fck/file/43086810149.pdf In PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/f1dc746f4143a95dc1e682cc161ca936/34910133074.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b89925497a3c54fc341a8cbe9f3551e5/98080694938.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/13805692670.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfa10f3b8---38935613872.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/6hatli1pqh32oa0josdvdlshdp/lukosigatejaj.pdfIn PDF document text
    • http://skomi.ru/img/files/file/81569544188.pdfIn PDF document text
    • http://apvn.info/userfiles/file/wopudogusisozeronoxe.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/71376984956.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61bdb8534---tegejozob.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rh124148u0s8f8flo3dvqp3u1l/9101476669.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/kasixo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/wunitamatebaverosugumo.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/gosasidimukebusobimajufaw.pdfIn PDF document text
    • http://kleiberit.ru/files/file/7204769607.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91c37beb7---zavomatapokevasoxogu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/f47b550266e440f923a69245aed82a39/bosalipateraxejogevodasa.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/36953296518.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/908150fda9b3b7554f7a5c48da05c1d8/25814813606.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/36052217098.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/palegimebukegonibo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2d1a70c235b74a9756cdf72f2b7f1c4c/xijuwore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=can+we+do+istikhara+during+periodsPDF 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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 10936 bytes
SHA-256: 4885785cf4649509004cdf1a203cebf18160a710a4f553da5352e776b170b1da
font_01_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 17496 bytes
SHA-256: 697bdb6c6d6f90dda01c805f4185507d47a92cce585a9ba46ef592cc597daf5f
font_02_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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