Malicious PDF — malware analysis report

Static analysis result for SHA-256 764d243157fde18b…

MALICIOUS

PDF

85.5 KB Created: 2021-08-24 23:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e009791805ccc07f8d5571f4515f8d8c SHA-1: 2cd067c2ca83647bc1172f350439c5954454d8f5 SHA-256: 764d243157fde18b2cac6e0bebf0c43b452253bce6990830b45412f87e417d9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a652ea7ea02---sutaxojuxul.pdf In PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/0085b6680cea8ed8690a47b00bb473da/94026734748.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/kafugejabofopujiseperi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972240da8d9---falikitetuduva.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/faluvemanetebiraw.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/211308151.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a064b08d3f7---78791047358.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/vusebavewafimodaxibot.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/jowudifomotubafogasob.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aec7dead0b4bb66781b47285e97fcc54/11104398696.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098985695a13---81126569003.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f46797b3e0e64c539426ca5222a49d9c/18814842533.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rd637qh1rrf7rdv3439qa543gj/59311716863.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/wesogakusojoz.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/pigalobujijewerimezalarew.pdfIn PDF document text
    • http://bociany.sk/media/file/mijomerowodev.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2f005e047---fasesobori.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//37529731617.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/mawirizuxi.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/javiviru.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/tizuxezapavegobibutanuta.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f23e7b16---81009721559.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4jv648vqum4amppaa8qk852jrf/volijemofanasefumosezagut.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what%27s+your+greatest+weakness+interview+questionPDF 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_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 17544 bytes
SHA-256: d2b8562728626a9e01a44d12f95380e4c85640db9646a3266ceb16635c2dfefe
font_01_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 10972 bytes
SHA-256: bec64ee53f7c694afcd60a579b6f6a6be4e3b04c9a60cf601dd73f134198b2f2
font_02_sfnt_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1