Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1869a5e990f7b05…

MALICIOUS

PDF

70.5 KB Created: 2021-06-14 08:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f186b2e11343b74c681c5410ca9d0bd2 SHA-1: 1266933f757ef842f5da4a2ad803f1de0e4c4699 SHA-256: f1869a5e990f7b05b855d9c006f829474cbe92a117f68eeb0f41fc37e91e55f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest a phishing or download lure campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=universal+kathisma+moporofeta+mp3+download
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30d8c45c0---gorififavukamo.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/72rem3kpe3phvcco2v2dom5r1l/82148506587.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e72195fb---8105132688.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f681ccd0---91517651345.pdf
    • https://toskov-yordanov.com/userfiles/file/95883734368.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/28630861949.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7bba260c1---19798234916.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/sk5l3a9jllkrnk8krunehvhn94/nivufulazitusuxuf.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/360add93abfb8a3046282edf9c5bd6e9/22981586302.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a8c7398496464e0b8469b33f199db896/57387854810.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/busapagen.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/3bc76b355ed3ddbb4bb140d51c7ae8d9/jusanatewate.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d33858a220714c49d66ab2e8e0ab0bb5/33340533064.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ab76ba30ec3f5c9be9f0c6cb80399ff9/gojojizetajibanerad.pdf
    • http://chataphan.com/file_media/file_image/file/pubakenofekowoxe.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fc90e647e8ac28bac8685a0eb078f913/zukivotis.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d486995703---51013021325.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/00e441065e2b09e82de1caadc4ad7a78/kerozigimefepopipeve.pdf
    • http://xahscw.com/userfiles/file/bebaxupizipuwitofejejet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d433.bin
cc682c1274f291c406cc399f38bd5bba1f171b0ab74703a425a331c2b10bb46b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 5652 bytes
font_01_sfnt_off0000e757.bin
81933380abbf028538188edec988524b62ad6632bbc529b536502fc9da2508bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 11272 bytes