Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d1667c29d67bbb…

MALICIOUS

PDF

64.4 KB Created: 2021-05-18 11:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2acb107169beb973005ca9ae04e40bf3 SHA-1: ea2cbaf859e712e3be7100975fd0a9f1d6c5f14f SHA-256: 42d1667c29d67bbb9d5424faacc321f7c50911570d702e6a46340975a8022e1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=ayt+fizik+soru+bankas%25C4%25B1+pdf+2021
    • http://jonkmp.nl/img/cms/file/49426188362.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/f0ead313674beaf7b962e0346867e33a/delikivununeruroguz.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2be84271356801b23cfb39127f7e358a/novesufedemawunitof.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d14ba89a---87287288556.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070615ec3db5---74116038971.pdf
    • http://x04ydivan.ru/userfiles/file/85555416619.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p421gien4db7gmk5q6kpnd4jf7/67777079195.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/242fa5585fd8dc7d6906407f316be543/mirijoluxekusojanadu.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/hkgok4gm5e36d9d8l1qjupcqk7/pirejibiba.pdf
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/heg154e2mlfu01i01bht8cct6e/kuval.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b5d2a0a2---tofixijiwikujevovotudos.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6b0feff71c139532711fa2b9d4cd4db2/gafelapiluwukaxe.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160839554a678f---58629456048.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d2a60faef---wepux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cedf.bin
45d1f8fb6dc8c7a01527b191c360dac74a4cc9239bf5bfc0766c0862f97b49e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 5708 bytes
font_01_sfnt_off0000e276.bin
24a4f45785279fb62091abfc169b72645490be78bbff6e2fe3324e1cd4078977		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 12324 bytes

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