Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29d6fc8dccddb8b…

MALICIOUS

PDF

68.4 KB Created: 2021-06-24 01:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc96cb3c89ca9babff44b2196fa40bde SHA-1: 7a75f5b62405681836ff3bc16f4d89f7b1c16d54 SHA-256: b29d6fc8dccddb8b9e0c4f961ecfdb21d4c91ef8b1b0f8cc52fcd51f3f40dfec
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8225

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807738e07c3---jamofukokurukedazokuje.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607301702f966---gatuxabovow.pdf
    • http://jjmcp.jp/userfiles/Image/file/mazadavu.pdf
    • https://nanyangtextile.com/userfiles/file/52856474892.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb5609079---93314961237.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607228b0b8b7a---72099832470.pdf
    • http://gelikonline.ru/content/Files/7273650313.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe061bf7977d99b09f1ba285f34d6186/71519126421.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160702026d8471---3033006431.pdf
    • http://tortsurprise.ru/upload/redactor/files/4720459430.pdf
    • http://grandinhr.eu/images/user/file/90145931242.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7r7p2r45flkhmkhp2i6936r6t4/73485486665.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0901997abc6c4198d248ff251302b376/85579794135.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608379e9def4f---ketaratepulisud.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc361358325---ladararewo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=libro+el+socio+jenaro+prieto+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da43.bin
801a5e5d9813ab97647f98f2fd3a911f2b4d551a72b8ed228988222b16af7035		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 5308 bytes
font_01_sfnt_off0000ec62.bin
0284e811af37fa8ee6d65fbe572957d27446055ca06dfc88a1fde3fc4ba6db0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 12776 bytes

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