Malicious PDF — malware analysis report

Static analysis result for SHA-256 6911a2ce92c3e611…

MALICIOUS

PDF

64.6 KB Created: 2021-05-30 09:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d17dc8b02bf2163db1a04b7fa0d2a88 SHA-1: 5418fde76aa024abf0dfeecd94c1a8685043f042 SHA-256: 6911a2ce92c3e61156cb1ea496fe386a7f9d7cc9a5a0e073048f940a44ba2f5a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

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://aeronautike.com/userfiles/file/tefupopebosatokogopanebup.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608392bf5e339---14124927775.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6552bc0c4---legodez.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d310aedd1c26ccc54fb62fb33cef88a8/dewokuwamewuserebetexab.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb51d963a---wotajopanuj.pdf
    • https://hospvetcentral.pt/site/upload/file/mames.pdf
    • http://thunderstar.cn/userfiles/file/20210503211518856753644.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/10b896dda8fc12ddcb850a974e209818/rizutukavuvapomiro.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c216236bc615824c4a0c884689a04010/34531930276.pdf
    • http://meble-tk.pl/userfiles/file/xigusopu.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/pmnl2njp74utdu73l7f2sa4k93/rinamujimesoten.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a055b54e43---92165328512.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1cff4a9442b85cc713edf51c0e8c0f06/morawibijovisazurapow.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/0266f3563e787033c5e57e9bb7f3443b/bimivibabujus.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a148a07957b20a053619830dfb096c84/22030712979.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+800+on+sat+math+2+good
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d8.bin
b5dbeb6e4fb7b0138b2e2c4c6f68c2dd34a2e6d9419a23407286aae1c40b6cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 5516 bytes

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