Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2677a729a41e99…

MALICIOUS

PDF

105.1 KB Created: 2021-06-30 09:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2254fc051a10487c8617d8bc778df028 SHA-1: 6d2d1dbb36fd9600076a4a2d8a977979d4691031 SHA-256: ea2677a729a41e994e224e4daa0e3a228684316d4e123929bf26d6554e05943d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/057ikdh5qbi49ll03ndf992qi7/12261380297.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098919f0d3c2---dufavalakedalevug.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f1555c46503f8de75d2d47b0a2b9aee6/80464835466.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785b9f5f88b---pavunesiravawuvedizagel.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/sifefegix.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/1632641402.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/80463463905.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071b01a3eafe---lesetikenavomafot.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/rileraduwedu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gopitutakovuwefigi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c3c2c48f0---lowadewegulepabaxilozito.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/dotubidudamarosepuzu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lr0hgaj10jtl0nmlomsplttu2f/87741892978.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df13957b1---sejamifez.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/wukenuwilipiwinarupale.pdfIn PDF document text
    • http://yuha.be/_files/file/zimepabudinirozi.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e9b8be4c230dd0fad3b0dc701ca0454b/2131296850.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/fexudoroluzoxex.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/82a47392cc0060424a73eee0386f026e/6675348168.pdfIn PDF document text
    • http://nakatka.com/files/file/zedalapasipavileselores.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/7270588008.pdfIn PDF document text
    • https://hirurgija.me//files/98470853705.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c761299962---73966232461.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/dn630fj6tpabnhiesr1rccbs96/93639435708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=aether+minecraft+pePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 5656 bytes
SHA-256: 7a833beda5524cf39f6f6bace7d5da3b325ada94579b5097ebb0d689c65294fc
font_01_sfnt_off000134c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD8 18520 bytes
SHA-256: 598f936b001bce77928186d5d89f1e84f4631d8edacc00233de06fc5a28c7856
font_03_sfnt_off00017db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB4 10392 bytes
SHA-256: e2f1336e86fda21959c7a48a58251d9b8484f06eb63fc9d8c41081a4c030be00