Malicious PDF — malware analysis report

Static analysis result for SHA-256 7956feb3990a32d0…

MALICIOUS

PDF

87.9 KB Created: 2021-10-04 16:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f043741bad4d34d9cd4c58028038100a SHA-1: bfc02384e39844f77e64fb25cd280de47daa00e8 SHA-256: 7956feb3990a32d0895e794342ca72e8a067b9f1923323eaf7d42674e8893725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=tattoo+cover+black PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec385698b5---deruzofufufo.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/mimulifuxuko.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/sikusoxeramiderun.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/zudiwefodamoza.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/xefubasasewaxefe.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/74452291267.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/kofaje.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/sotavokusogobuxib.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/16112067767.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/76887239280.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ec75882d0a2c37104ee01f6c951add16/xajajotudifodogexax.pdfIn PDF document text
    • http://guchen.ru/d/files/lilesirasinoruleju.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/10539849503.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903183445.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b95c2be143---dekapalulixupisesavepowip.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/65580360851.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qma3nj1cdj2odkusjftgeh4kth/vosixijo.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/rubimisakuf.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161460f9af1d47---taroletub.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/84421216150.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/47868222899.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021092823162373499.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/12496056709.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/zefegiwajalavokebove.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ec8uiruka0hd8th9qg85tt42g5/65907429628.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/jopefejenokopo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/tanugemapilusisovijukaf.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_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 19544 bytes
SHA-256: c61de319702b787bdc2d901a7f7542729917dcf29d631af63f0ff6e6f7cfc932
font_02_sfnt_off00013b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B12 10120 bytes
SHA-256: 3e06099067769f4b19438da609c83faada87d894fbcbc06ce62c28373a417de9

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