Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed64820b0e3bbe25…

MALICIOUS

PDF

86.6 KB Created: 2021-08-02 02:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a086b564e83530069f0ac0f5076a7ee4 SHA-1: 948fa585fb027ae134044ffc4e56db6e812e6424 SHA-256: ed64820b0e3bbe250fb3254a31ea329b783649cf43e63ea94b87a26a27d15c28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5d637859cf23024e959308e46ed6fde2/54036614822.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8f4de4e7677992dad93a176fd5a89e33/3249876089.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be5cca02965---pigagodunudini.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/jutikoburegolakamir.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c246f14f4---fuvomamixivutisa.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/kukupodimo.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/gizixozanezasez.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/82952039341.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/41640800640.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81097facf---53827432372.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/jujaraziluporujalat.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/nojadavade.pdfIn PDF document text
    • https://hoongnau.com/upload/files/pazodelewa.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a08090858a686f1586ccc9785440f5c0/magavelupogejipuximi.pdfIn PDF document text
    • http://praguetransfer.com/files/file/ralabepofejilidur.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/pogeganofodumedafe.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/gumozosoto.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/37019993602.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gupapuxutawixupanesexigi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079743286088---kunidefujijuwusatixoda.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/76409052216.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/62991364390.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3d7249ed6---92007632153.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/30331014716.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/sibebodobapimevamefadodu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ljabmke2rqafj7tjicgutjc12b/bimugevupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+the+types+of+seminarPDF 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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16904 bytes
SHA-256: 6d5d76ba0b5d8f46fcfaa89b73c13723ee1bd14988ace8ec1b2245091f9d22f9
font_01_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322F 10684 bytes
SHA-256: ed20a67de524e4f8e28df1c874a9b3b9afa2a6a91a7e8aaf3e81bc38d88cda85

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