Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98be85fc6b49c71…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 22:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1ce9ca2c2a5af318477fdb786ee600b SHA-1: d12a3da412051a25141ff35541598887a73459f5 SHA-256: d98be85fc6b49c710e933f00f18aa138c6bba265c5fc8739bb454f8dd1baa6b2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://olamare.com/img/uploaded/file/pijuw.pdf In PDF document text
    • http://yibetter.com/data/files/5713592369.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5c31c66f---muvulevupi.pdfIn PDF document text
    • http://lawngo.net/fckfiles/26448593367.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/90615917064.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/gadovukasozojukesadine.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/36774023679.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/lubali.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/44277227451.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/movinimisiw.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/xizukuxedugowimedevosadoz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/samabinejebuvaneru.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fc7c44151ab7b0bdb7706a1abc9e9e1a/vumexixosizobudusoji.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/fogatu.pdfIn PDF document text
    • https://12waktu.com/contents/files/zironimokerelomajodo.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/71382596628.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/7037721009.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/buxeleluko.pdfIn PDF document text
    • https://pixel.bg/img/file/puvapixikemawofuwekifane.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/romikegobaguwejebuneli.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/96257887545.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/gimuzuwinamakefeke.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139de95a713e---91875182599.pdfIn PDF document text
    • http://umartravel.com/files/balosup.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/lupujowibil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mod+egg+incPDF 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_off0000c36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36D 17004 bytes
SHA-256: 69c9929d9ba1858474263e7b9cc98f087a7e330a9aa3f39c0e807ba07bcf8682
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 9964 bytes
SHA-256: e1e7acae040c6d5384d0e9c1a86503e518cb7cb1792e514ecaff591172f4c5fe
font_02_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1