Malicious PDF — malware analysis report

Static analysis result for SHA-256 443da3829c3b7f20…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 23:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e61ec1cc0ebe19f89c916bfcb7cbda8e SHA-1: 94c31d2187d291c512a4ed197a20910e8b202d11 SHA-256: 443da3829c3b7f201060e04fe0fe1e85a0c6400ffa3a6426eb512615eed7507e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=a+quiet+place+2+post+credit+scene PDF link annotation
    • https://felicityokolo.com/file/47907277129.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/31619640873.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/daliwexet.pdfIn PDF document text
    • http://precisao.net/files/files/satimusomelusefurubagubo.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/nutitufusovare.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/42421566640.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a36d686c---82436139687.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/66690892721.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/43430131710.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/55759706647.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/59161185464.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7pvjtktjosv528tl82ncm0vne3/87032576597.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/74326466533.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/1141834962.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9c7ba87b---vibawiwamexolofemaxuxodej.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/zobabupeduwivakixome.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353fafa5a85---89152008969.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/14332220750.pdfIn PDF document text
    • http://art-ball.net/files/file/sodaluzizepipaban.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7446344c---fozubufujexefatojelafajez.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/11352723087.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94ff86b11---poridijerolejonunokenuz.pdfIn PDF document text
    • http://secoinblock.com/upload/files/25752040783.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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 17644 bytes
SHA-256: dfa423122fd6b6fbf8d9756cf5c3f7c028eb88c88a064a0bae29c120c497a833
font_01_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 10856 bytes
SHA-256: fa5c731d19a81e1b168dfc1a08b8640eb3da772924a35a64e6e80094870a8c76

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