Malicious PDF — malware analysis report

Static analysis result for SHA-256 9593eeba8c92ed55…

MALICIOUS

PDF

61.1 KB Created: 2021-05-15 11:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad948f439e6247a51b13a4951b18117 SHA-1: db0f0ef7c915c83fcb94656a01a64435ea66952a SHA-256: 9593eeba8c92ed557bc23d45fd3b6e4f54d8a3d1dd06c4ebd4a30613481d92be
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=api+platform+custom+pagination
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8c7ce938---zezeziwomajulalatekusipe.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tgva393qiu348aq1gkq2g9dodg/zedamitiliwadodezuvi.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fvlf1h11o0pqn17h05uu043vr7/25444527196.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071353f05c14---96302968776.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607938d3aa60f---51383885929.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081311093249---fogudav.pdf
    • http://sarljarry.fr/userfiles/file/kaxelopivitofabidobaw.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae80bfce3---xezawekawelawedufadomeli.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608318980c87e---75920663600.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/60c62fc3f2ba19d53712b10e8a9d026d/72680790726.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/090a3fece641234b1917d0c70e61a3fe/rakejawedupedumepivufato.pdf
    • http://alhouti.com/userfiles/file/sirujudalogeriximof.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8d21095bd67ba2a6e99aef4984df2216/pimiku.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tobixagiferuxigiripizugi.pdf
    • https://alutat.com/data/file/derovavaworojizikatudetad.pdf
    • http://sosnovgeo.ru/userfiles/file/86142519289.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/prnavq0i7dq9g69vkd72onctkp/tuferime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c841.bin
f5310e35d2ce02017a9d8cea7195285db8e89b30028a533505985cfee76f4d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 5324 bytes

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