Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0770cb0ebb3324…

MALICIOUS

PDF

65.2 KB Created: 2021-05-04 08:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fc61061ca3c7cd3264bb6c46eefd001 SHA-1: a364892ef532a68090cf128a1774b5017a150278 SHA-256: 8c0770cb0ebb3324c66689d9fa008d2afb60379b7c6e76a91d38e64ff809c61b
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8424

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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d244f18c9eac7ef44a82865fbc390f04/tazufelaxupazuwusewifuda.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ee3e0a0b---dawofupetazaxavusozofisu.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09be270c2---79921534231.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073a154d40c0---velituletezinom.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608accb1b069a---67285978900.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160748cc051170---42624722122.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e67fdb074dcf9c503c515d28e7a2292e/24367191951.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/78deb8d0e4ba2a4f368a13ae5a51c595/62259972285.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0moba0mkt01od3uvjsr08sqoa6/jurop.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16073c6b7998d3---18001596708.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/85eea5b29f8dc23105a0db73f311a9cd/zifuwivifom.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fec284ba---belozibofubipepiwoz.pdf
    • http://meble-tk.pl/userfiles/file/44927187639.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4663b5cc8---gixixakedizas.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160730e8fcac14---76592181738.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd96a5499---zigufubosapemuloru.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/tomq27rdu2967j5si2jrnjh4mt/85910308335.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kindergarten+phonics+worksheet+printable
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8324d781738dd1aa1f239dfdfafcdd5e/74137264550.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c0.bin
8706316b23542d590e8b6db63414257e1673df4236f7631e1d7611774ec6d915		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 5600 bytes
font_01_sfnt_off0000e4d2.bin
ba1973925d228811644386bdd139f83e90ce1d6700d0ace78ccfd8c72bab6fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 10192 bytes

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