Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec52ec4860bdbbca…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 00:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49187fb9373fd32d1a8e57327cdeab82 SHA-1: dd632f876bf3e17d0a85534fa8476412b8fb0592 SHA-256: ec52ec4860bdbbcacaeebc103bf567905400f41b4d0a78521a5a92a3fbc75b60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting or compromised CMS upload directories. The presence of embedded JavaScript, flagged by heuristics, suggests an attempt to execute malicious code or further redirect the user. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sasmedm.com/www/js/ckfinder/userfiles/files/vinavofiroruwazurowimiw.pdf In PDF document text
    • https://siahotel.com/userfiles/files/masagemeroge.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/desapaji.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/21595545995.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f161b10582---5458600107.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/tolebavanagovoruzavavu.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/1290812763.pdfIn PDF document text
    • https://fond.ru/userfiles/file/rujelejujoxux.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/lozif.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/89959515945.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/jomikis.pdfIn PDF document text
    • http://pronobile.com/catalog/file/89482015162.pdfIn PDF document text
    • http://strahyi.ru/images/file/sovefazigone.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16137aac4a4132---zoxodomopugenazedu.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/xawikus.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/23485201.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/bofevof.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wagapufola.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/sizovagifimaxesudud.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/didewawukel.pdfIn PDF document text
    • http://rideco.hu/upload/file/79546100465.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614427ba8573f---3010676457.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/jafiritadirej.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f13346b6---suledufawujovul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=openload+punjabi+moviePDF 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
stream_004_off0000d90c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD90C 17608 bytes
SHA-256: 7375df7efa73f91dbfaf6435d1fbf5717965a7f2c08702d9a132a0108c5d5878
font_00_sfnt_off0000c0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 10648 bytes
SHA-256: 3376890f361387c738b7e1940a368f44dde472e6191a51e1a5f91c696dd29562