Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9e84f71c683b5f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 05:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3d7d08b7d2d5ce3381313acc5a5fd64 SHA-1: 59a258e423a7b1d463e915ec41c99058ce094d5e SHA-256: dd9e84f71c683b5f8a796239536f4af86142f75bbb13aa3666a8343ca97b597b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=les+animaux+male+femelle+petit+pdf PDF link annotation
    • http://2ds-creations.fr/userfiles/file/wuroxojemepedokuta.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/pajevapazejevexuz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982da716728---81383448768.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/jidirimimomif.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161108fa7050e3---72836875406.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/jojuxasezasorenewinanol.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42e79ec7d---94497740181.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/mogokozofaregobib.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161195b9a77ec0---kiwasedizepoxug.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/55b47b09198025bbfe9f9bd31eea3f54/gudibadasibo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73a8cb40e---parubotemutogewowawi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a2d46816ecdbaf49ac6082be80101d22/winuvu.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/p11cmirv94gbfdt57db629ir53/15228493364.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/30609683089.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gm236kdsnvvf8e1v255mmok7f5/nuduvoge.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/62876630303.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/fagulefapovef.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/3022525914.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/21122672553.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7bdda1c62fc54bb65f8fa1925db300d9/13039498381.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/81516021423.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/nutijiratepowi.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/2132531312.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c747c2a54d---pojexabimapur.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081418686726---11157438545.pdfIn PDF document text
    • 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_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 20424 bytes
SHA-256: 99e231338437fa0266117958a625b566954c42e643405892a4f579540652fe33
font_01_sfnt_off000115a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A6 10600 bytes
SHA-256: e22478f2d71eb7c54f65c33c6bbd41546283ab6bcae4eb2e50e6accdd75a8a43
font_02_sfnt_off00012de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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