Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea281a9480f4a859…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 23:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a88274cf68e06c8998087bb0c59268f0 SHA-1: 67dc7597a4176b8a0657096a97b26724d0ec458e SHA-256: ea281a9480f4a859c7c4ffca4d9eec9b7b0b2dc967f683a4fd0bbbb5993a0af3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to potentially compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and varied, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://szermgrt.hu/uploads/ckfinder/userfiles/files/45732914521.pdf In PDF document text
    • http://colantuono.it/userfiles/files/vuvapemodepaluzo.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/84498931817.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/80735077149.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f35f3815c2---roriwewasakakedekonupijip.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/retapuwapewar.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/47219650220.pdfIn PDF document text
    • http://15881588.com/ckupload/files/42446202448.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109080132153675.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/dodakududizodorito.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161312d81b4107---77606474520.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/dudobekukebexikap.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/65281366193.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/5848558315.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/virago.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa04667a95---62054129802.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/xurawomofufisikasalagopu.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/nitijemojinuziligonun.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/rilegabukil.pdfIn PDF document text
    • https://slide-bearing.com/d/files/kexabigovo.pdfIn PDF document text
    • http://cmtsport.com/pliki/famidumodevidamofazozed.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/mexelinilunikovuxuvev.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/gafeneduzibosofufarigaw.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/gawivovoj.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/81236911848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=keepassdroid+failed+to+store+databasePDF 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_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 10516 bytes
SHA-256: e3df3e7aff18b48f2d9084b5d67a81ed7bda8c21d84c977fb4bd083f09ee79d8
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 17460 bytes
SHA-256: 7bf85d383106ddbcee2808eeda9ae13f715971c9dc2a359ab1004705855f714a

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