Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cf74d7e7193742…

MALICIOUS

PDF

132.8 KB Created: 2021-06-06 08:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4355fecf812d244e4e4b7519691623 SHA-1: 06e37c44d19199643941f39c0c916c22fd5361c8 SHA-256: a3cf74d7e71937424608731e7062dfc4acae24a0866e25e5eba9b7f52c7d43f9
154 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters indicates an attempt to leverage search engine optimization for malicious purposes. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8269

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://irlanc.ru/uplcv?utm_term=geometry+dash+world+download+chromebook
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g32pfstlefudlvkq2dji81c6e7/12740972160.pdf
    • https://grandplaza.bg/uploads/assets/file/17434774451.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa77d824bb---xonigudebajulowenabum.pdf
    • https://cometsecurity.in/admin/userfiles/file/xakovonep.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/54632e9a36e47b533de4542ca58b07f7/xewemoxugijuzul.pdf
    • http://katachizu.com/img/news/files/53485347195.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5530b2f81b---kavasixekevib.pdf
    • http://short-story.ru/upload/file/kutomajeteneven.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ac67d5d9---jonomegubajigufu.pdf
    • http://vitanova-cattery.com/upload/file/gesiposek.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090046e033b9---369467207.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5bf55c58---98652557679.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22344c1551---26296672768.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/b1568480f865415e91101e633c7ef5b8/54948876975.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae11390a3---93941257830.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/21cde784bf6f802720a856ba1bf051a1/13369609777.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a224f81cedb---25569006051.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001a8aa.bin
e7000b1d767470b6a806535d716bf214677c564be524055eb118680a6d3cc7a4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A8AA 26672 bytes
font_00_sfnt_off00019807.bin
c771749ac430df80d980b7b547ce8d3855b3538cef4b0649cf9476a0c216e958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19807 6676 bytes
font_02_sfnt_off0001fea4.bin
fbd49a8ed482ec919b1b7a9e1ee4fddf44192feebd4b8bfd3da2d9d8825e3ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEA4 5608 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.