Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc29fd9d5bfde453…

MALICIOUS

PDF

66.8 KB Created: 2021-04-30 11:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 582050c7fdf9195caac5e7ce9246c6ae SHA-1: 11dc19a226be81e15a27aa88c9257b180144ed7f SHA-256: fc29fd9d5bfde4531be410579466ac0d2c30c2be90451d975f3a332d78f467fb
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'Pwc digital ad spend report'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

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 http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff10d6ed9---55592110319.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727e20734c5---sinewere.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3fa7098f---98972404286.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/0e57d6fff6579fe1a544288ae6d67515/60182554827.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182ce5b68c---redoganewirozivakoja.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/igkgmntmo2gt6564iu6r4eel56/74076373341.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/938d974b857cfc90005ac0cd8db5897b/5773767168.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077235b5b847---78703587198.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf6b80801---20002010106.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/cmsevcsh2cu71i80uidhm4jbkd/zonuj.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890ba6d9746---56794256978.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/14f5864af0132eac714954a81b3edd32/zabikudevosajob.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/114cfb5811b527553b92a17b583a74d2/20179393152.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5e4591eb632b4240957384e627d6a370/gulegivaviluvaxiwug.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9b96983b8b4482065a96c4151512d73d/67422045604.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pwc+digital+ad+spend+report
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedf.bin
f37153512d8a855cf0e3dd8fa7357f927286c5e3d082552997cbf45303a04db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 5332 bytes

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