Malicious PDF — malware analysis report

Static analysis result for SHA-256 497cb8a520b3f4c4…

MALICIOUS

PDF

64.0 KB Created: 2021-09-03 01:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8b27f971f4ee35ba6cd1eba96258f59 SHA-1: d97412c1e75a2aa100150981d2395b7347f743ed SHA-256: 497cb8a520b3f4c4c215b58a8df4eab916f47a6693b90a23af1fb47e4db855ec
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple external URLs, some hosted on compromised CMS platforms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely intended to direct users to malicious content or phishing sites. The presence of numerous unknown URLs suggests a broad distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

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://huerural.com/uploads/image/files/pujewimizarin.pdf
    • https://glory-aqua.com/userfiles/file/bitega.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/benugilawaludeperasamuw.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/ruwunovogojuzapud.pdf
    • https://cplastik.com/data/cms/file/74547329757.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/fokamowafefibuvox.pdf
    • https://motodubai.com/uploaded_images/files/93367989716.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079804025dd5---xivim.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ros5b8ggtcba1ubfs4u0fsm5oh/76149336568.pdf
    • http://www.ciesol.com/ckfinder/userfiles/files/10255469121.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/ropojudefesaza.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f9228f333c768ffd2b4bb5b507f868c1/silegirujegikigumux.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ibv9lfv4dvjer1gbki8j0ga2ck/medipekogagifosuni.pdf
    • http://pc75.net/upfiles/file/1630427663.pdf
    • https://mabuksusu.com/contents//files/bavimexulekexuzabubiwu.pdf
    • http://metafelix.it/userfiles/files/95385078731.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/32441119836.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/57636836525.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c92d44ff---tagubo.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/50v591r0gg9de61dv5rfh185jl/xosonajofulujetosupef.pdf
    • http://markone-tools.com/upload/files/gidupixazedobo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chestnuts+roasting+piano+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6dc.bin
1a22c045337431b14717ce9760a7bee17dbdf7b4663df4e62e7ed68a42747cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 10860 bytes

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