Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c80432404125ae…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 03:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dec76da52602eea1c5a7c4323776f35b SHA-1: 958d9489c39a4894352a59e2cd81c98e42318d20 SHA-256: c0c80432404125ae47eb44065a79687c46bdbf266fbdccb225cb48cf1ac78613
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=casting+phone+to+chromecast PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc04088321---jojiximufodufakomugubi.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/32435843636.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/34488604486.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/39500966172.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/56556194291.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/11518529751.pdfIn PDF document text
    • https://mallenmediations.com/mallenmediations/images/userfiles/file/xelurokudunezaru.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/11637769404.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/80190038567.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210906041621.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/divipotowuk.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/vuxibopapowenodekosoxeja.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/dawatulu.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/bugedugopibilerewule.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/jajatukeg.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/24400750691.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/681b3665cd68d9bf53a3ab5401fbd199/mutebet.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/35112494686.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/236u5mvhm2nffqk61f266bjall/waxikabar.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/19420366452.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/19260076121.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/86755362583.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_off0000aded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADED 16092 bytes
SHA-256: 5ee8cad7fa9530692f22c2007ec7022bc559daaff2012a363a621aaa4a01ea5d
font_01_sfnt_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 10808 bytes
SHA-256: 83618aa415df509a500ecc0c5400dcf028c7141520095da99941f0c8f8da7e42
font_02_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1