Malicious PDF — malware analysis report

Static analysis result for SHA-256 593452151e34bde5…

MALICIOUS

PDF

89.6 KB Created: 2021-06-30 20:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c47fc7d1cd35d619e1caedb2e2eca80 SHA-1: 6d41db2917de40530a35d2e7846b00fa8f9859a7 SHA-256: 593452151e34bde584b42b20d76fffb909cd49ddebe3f94899c21960a216b514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://erdenet.mn/userfiles/file/xazekurad.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab86259499c---77389323376.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/dubisesemumupusukozekisel.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9f315baa---21073050721.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c3dae424e4d61d960db16d3e88ea9e1b/79866503367.pdf
    • http://dongfangguohua.com/ckfinder/userfiles/files/menet.pdf
    • https://ajitcoatings.com/uploads/werojavuwarifug.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5vkc2l6m486v3r37l9nuj9l6gl/58708361636.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6aed455e---binalaz.pdf
    • http://www.findvoters.com/userfiles/file/tuzaviw.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/91f8c8b57d323f7cbc2c815431fee4ac/19828878190.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4f74f72606cf1cd7b5e413fb0844aa05/wabikipo.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/naxijagep.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6385cfed7593bdfda7bbca76eec35da8/jadegoleloduj.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a75a6e88---wuvuduvojefanujinu.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e993e7784eed0d68e3f84b0b382b6624/30800581637.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/sopibojajefojiwubokotumus.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5231f2ed91---setavi.pdf
    • http://mobiliteit.nu/files/zesabubibirefitogotuk.pdf
    • http://blackivy.pl/userfiles/file/26580242199.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chemistry+class+9+selina+solutions
    • https://mediaget.com/userfiles/files/8329843594.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_off0000fb8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 16792 bytes
font_01_sfnt_off0001139f.bin
cf0dae2e7077907190b31c46df1f4634378d2b3a09c5ef99c305329ffdd83121
pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 17088 bytes
font_02_sfnt_off00014006.bin
b45e7c1dea19fcfd461a73746b451d2198de7f0e62e351f2b64521f3c0f1b005
pdf-font-stream PDF embedded font (sfnt) at offset 0x14006 10908 bytes