Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae4eab4b1da7d07…

MALICIOUS

PDF

71.2 KB Created: 2021-09-06 14:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1481015e423ed1606653c393b372978 SHA-1: 1f78784fd5677db39fcbeb75bddc2b06ba3be09a SHA-256: 8ae4eab4b1da7d07d977214447b14d3fa486237eae8f1bc3224adf975b298810
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. Embedded JavaScript streams are present, suggesting potential for further malicious actions like redirection or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://medvor.ru/uplcv?utm_term=bakteri+pgpr+pdf PDF link annotation
    • http://soflocops.net/clients/81266/File/pokozidebulexazisogewavo.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/61027650960.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/saguladixodigepenake.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107242043059619.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/67305791288.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/5v6s0hnt9muid1tb392iq67rf4/59023602183.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qa6nhre6eg6ugo7nnlcfg60b3t/sexasurubara.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/52449837558.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/87737712200.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/zedejamoxopukeful.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/87861064c6f96e13d7431a9502d6e71c/pogokokutesadufebolo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d876dc995d7019cc35c20f1d6a0e7727/gufixivobexubogamureda.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/77503315673.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/pelamujefukedisilo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5daa9b28c6f6199cf471f39c4b3aaea2/wobuvegobowo.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/9252950673.pdfIn PDF document text
    • https://airshow-bg.com/file/vutujewuzulisaniriwig.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog//file/88155147136.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607887ac15477---15960964114.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdcdda92a9---27581104269.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/bebimatudolajaguxajojon.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_off0000b2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 17648 bytes
SHA-256: fcb58b89370cb35ef3bcf1fb10b45cc15ea9c136df341f91b430454f69cde7e8
font_01_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 10380 bytes
SHA-256: aeae0b34d6b5c5391c8d258a05cc5905638d5abb98c33092fae8825c247a0210

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