Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8e521efdbbd254…

MALICIOUS

PDF

93.2 KB Created: 2021-08-16 17:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11d93c8ce69ae6bcc6c4cc09be7365fa SHA-1: 1cd98dbe7bf91727c5d153f3837ec28ecc6ecbb0 SHA-256: dc8e521efdbbd254f3a4a8ba541486b124b5ba836ff0c24fb822c658d78c20ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure point towards a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://anvlaw.com/userfiles/file/zigarekuteketasof.pdf In PDF document text
    • https://rainbowfurnitures.com/files/files/dexos.pdfIn PDF document text
    • http://houselandia.ru/files/16011697205.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4784d9b66---kasuxaxanexalewenebigeze.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c2167ea2---kakilisiz.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/833595c7b17ffe72d31a990bfdff4922/mixifebedor.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/28693679165.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/15071408976.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/wepavipufi.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mavobifitovolabuku.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/29f9dabfff62483fae248aac718d7ce2/wulafuduzaliw.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/wofadatozewiropug.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609444a51a41b---8906003995.pdfIn PDF document text
    • http://sakem.org/userfiles/files/wixisuparadowevov.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e1f2446f---duwevefeligolafowabef.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4ec44141---xekokodepi.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac573a708b---83470500790.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607565d745680---busugi.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/nubegubejodatuzajaretufiw.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/budemipenojugo.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/18873094490.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/35516945280.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/50bboj5a8hfpsjo23k5qfbepdv/nazejumet.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/63031026926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dogfight+2+unblocked+games+77PDF 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_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 17644 bytes
SHA-256: a9bd4e31969440a522b124dc3a51eb24ae7e6e76dc466044e1b340c2bc6d054e
font_02_sfnt_off00014bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDE 11328 bytes
SHA-256: 4ca7c978891a194adb22022e36f0baa240c62433aeaec45b1ac1f9a85f42fdbe