Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a84c55b72633ef…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 15:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3988f9697d58654fff4792c7a9c6992e SHA-1: ff88cf1fc20307ff9ffbda507e74bead85f0e126 SHA-256: 39a84c55b72633ef00f255627e7d7015a74b66a1025a710b052872aad20d4c68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://krisoc.ru/uplcv?utm_term=survival+games+2020+movie PDF link annotation
    • http://posekatzahradu.cz/files/file/wamun.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0581e0d4c---lafovufivaxumavonumefev.pdfIn PDF document text
    • http://budropol.de/Upload/file/deraf.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/wavolur.pdfIn PDF document text
    • https://webmenuplus.com/images/file/funovetuta.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140009d67ee5---nuxal.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/wepixiwanevamulevisamivig.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/96602717897.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6626be37f0294c52864eb9599fb9ef26/wujujiwefunepit.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/28651085169.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/72182637995.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/morito.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/90101523706.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/weterozijepoken.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/rumujuli.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/vokuko.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f465e75f60---wunewinev.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/67261113450.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/togeritudadetitaze.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xutisaseladulenasewuvevig.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/gufasuvixa.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161418d98e5866---79655107005.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/75933861324.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210910200328.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/dafumuvalovoxufet.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/30414244512.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 17248 bytes
SHA-256: 0f7c7971a54925932ee95c876b389f7cf2f5ff3e19ef1eaa442cd4b00287ee1c
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 10732 bytes
SHA-256: 2f9aeb63e28600d0794e373149c819164665baf9d941a9e1fc666bb9fceb5305
font_02_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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