Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1b05369f0bdd4b…

MALICIOUS

PDF

71.2 KB Created: 2021-06-29 02:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fd52a0821d40087e2c2ec4cc54fd61d SHA-1: 52fa4134a66553c510a4c96c49235d4c588f0d94 SHA-256: 1c1b05369f0bdd4bf3fb290fc39c25977558159085d09a53c773849e52051602
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of techniques used to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7429

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://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/6tsf84ohf2u67fqhm2hkbrm2a6/zogudotobijufox.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/52aca573bad8ea6781e1bd983d4240c6/wojeli.pdf
    • http://veraschwemmle.de/fckdata/file/doxijonegux.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5f9e0f2a---pelemojejeson.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9fa58c716---49147841429.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/h059c30p3ga8kpn7fp6e7uuiic/84282118091.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc99a88815f---45017072143.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb786ed4bd1---madijazazonod.pdf
    • https://cornwallstaffagency.com/userfiles/file/xuzoxagarolewader.pdf
    • https://semineebrasov.ro/printuri-fi/files/40845856327.pdf
    • http://ingenermarket.ru/userfiles/dabunokofozuju.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/milafirapar.pdf
    • http://extracam.es/app/webroot/arxius/file/18678526332.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b58d3135a93353413dc6228777f366ec/getinamuw.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7c4119da---35457192322.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7datk33me2g90cudl2cnpa9r4c/bubunesabeludojupaxojirun.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a45f4a0e57abe05a458ecb08e9a2a49d/75063186697.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77b97bffd1---21516605454.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/xufilu.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c8b737ab40ac9e83c0b355f742d51c7f/dakob.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c607501ac43---maradadafa.pdf
    • https://pellevah.com/upload/files/67507970346.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=john+wick+background+music+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f435.bin
c0ec7f7f4153fe8c912ae4cd3438bbbfacdcfccc6c2dd692a9bccfa23430fa4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 10996 bytes

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