Malicious PDF — malware analysis report

Static analysis result for SHA-256 823ed69a483884a7…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 08:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e62ce65efeb1abcffeb7efd5e17b700a SHA-1: 1980484a6ae7d39781bac52544dd67f2fe9c5a2b SHA-256: 823ed69a483884a73f85e6e2e92d291b92d899542f92b0d55fb9a17581922829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://allytemp.ru/uplcv?utm_term=idle+games+unblocked
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ecb11d62---xizumixigas.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607deea566f81---biduzapomojirag.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc498dcbf---83240738836.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6778d40f9---10387160195.pdf
    • http://www.knickmeier.net/images/pageimg/file/61741043309.pdf
    • http://pwr-tech.ru/userfiles/file/jofirukokivosumu.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f383329e8f---82036539002.pdf
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/t7u6v93sichl3retqta5lltajp/vozojexejo.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1192f819053a0673c78ff2c0e777555e/32703276177.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d39535224983bae91bf3dbcba37d0f5c/jumowasedanetuk.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160950c25a2245---rituguvifesiwarejibakuxow.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa23b8ebe9e---24770524841.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/h5gakdvskd4bab962qsg46qpvu/resifipunumevi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db73eb3eed---gewabigudazidof.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbb990087---sixusemajosadadodebaxotij.pdf
    • http://beateromer.com/bilder/file/98052077292.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/hoqeq3ejllo3bra9lkd7dugacd/bokutisowun.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff1901b68---22629200043.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50f15b6a2---nubiwakepigibar.pdf
    • https://dolcezzecaffe.it/file/31339433978.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/36aa3356b3580b34591dafbafda513b0/57292374806.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87155d3251---bogusigopobovavorilab.pdf
    • http://anthonyvienna.com/sites/default/files/file/nosojimobakuneposepitap.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b72967983cc---87422370848.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc56.bin
9d32d33c371fa671eea00d1912cbaa6f3f5312ce43d02a5c2303cc2ba21f23a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 10708 bytes
font_01_sfnt_off000114ab.bin
2bc0a697f4bf3195c0ba8cf0163930e4b6322185ea745b1cddd8ee23012440cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 17660 bytes
font_02_sfnt_off00014295.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14295 16792 bytes

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