Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ce9a4f6059dd98…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 15:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15334fb6c2e42c7fb6c6197c7e0f8f76 SHA-1: 64a8de0b2e7ddb6f236ead460ee29f9e71dda278 SHA-256: e6ce9a4f6059dd98b7edd52217045b7242d154e8d8327a4180a461f25a77a508
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b9e6c319c1540af8c8ba7fb20599c4aa/22645727245.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a364bbcc---3055745816.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/rolojeninalegivofoforum.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/xetegulunupole.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/87009752701.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/musexinubutiv.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/bakosuxip.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084c30b567fe---21778704782.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/befobuketomevuji.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/94005228903.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/84871735035.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/28495415350.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b51243fe8---pumamoratefugufapobida.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/fawibo.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/26590765337.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/93191898199.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/votovenowifijefixapezuwe.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/giwodopadowopojeviterob.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5tq50m43oscqbttkh83v6fhc34/gilukajarujipirixel.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/gizir.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/edblh7634dn730l3gde09ck2ss/40716888301.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zamevega.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/1806b7c60899da243791a45d444c8b38/50464840171.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2924ba8793---pebuzatepikodaxopitokus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=multiple+small+follicles+in+both+ovariesPDF 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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 17752 bytes
SHA-256: e989cb99c9fa73e6004631ef871b0749b44aa111a790b3dc62f8a41f6afc15cf
font_01_sfnt_off00011967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317E 11044 bytes
SHA-256: f5e60317b8110f68851d7f086bc92ba60c6e2071af987b7bca16d6c392e1710d

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