Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cf8c35583c82b9…

MALICIOUS

PDF

85.2 KB Created: 2021-07-17 00:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fcfca52a7f8265ad1ec682d7eb45252f SHA-1: 2f6ac493e464705a9b09ba41b60d88d2ec58eea0 SHA-256: 52cf8c35583c82b92f2846272e2eaf4190af04781ba5f6ee39afe21480e6d1b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on various domains. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609619423a246---jedolugojod.pdf In PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/35586389346.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/59819835069.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086b321d1d9e---57770751463.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d16d29b5b5732e197f1e407cb2016d25/zejasakuguwijipufutox.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee388729d---43332525653.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e4b86602---76067340579.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/zegag.pdfIn PDF document text
    • https://exxontel.com/file/jalafizagatikirak.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/refeg.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/zepunaxesile.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e56511d5cde5844d1cc08ec41c15b0bc/gefaxadozop.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/35030518275.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/10970c770d1778ec1448f29a77313f53/zeporujusof.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/16629359002.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/81405fc7ecf02d1c078f998a70f50b15/51267530184.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5f233376af437bb324da8480e9079ed9/fivojefijuxinit.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a1tb5lrptdq1upcoj28mp8lna0/wupidujotinidofinuw.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/46769972990.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/pafaxukutujotokojiw.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/772a042a808156968609a8cd056aa355/59206931396.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e95366574b---mazanovu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e41e9e7e75fc48de7d61a98250c55111/sezirixazanafajeduridege.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/90740812218.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/gefarejuziwogogebuzimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=compress+the+pdf+file+size+online+freePDF 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_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 16740 bytes
SHA-256: dc6efd35f49aacbba2983eca2483a912528633e5ae514c81e9e095e9be0a08b5
font_01_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 10692 bytes
SHA-256: 49b42e8d0c29fd8d01617dc8844d779d2e45efec120a2f19fabbd4acef4c6cca