Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf20bff7d1296b15…

MALICIOUS

PDF

170.9 KB Created: 2021-06-19 02:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ffc8e81b328c22208f7e347e046811f SHA-1: b7d7d7ecc4541cc62b5b685aa2db0c14ec43fb0d SHA-256: cf20bff7d1296b156ed6031d10d77734d99a03ea3702dfb2849cb658d1176362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not directly reveal the final payload, leading to an unknown family classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8277dc6ca4---sepefarexesogilugipal.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160727f2493560---lumuresasolig.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda7bb5a7b---dutumetafifa.pdf
    • http://coumert.com/images/file/zoreritonu.pdf
    • http://gmei.lt/ckfinder/userfiles/files/xetuk.pdf
    • https://theatresaucinema.fr/uploads/file/misejunegulofa.pdf
    • https://ktmcollege.org/public_html/userfiles/file/17403536546.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c2c71668---tenozukowuzuses.pdf
    • http://sotel-perm.ru/site/file/74782136786.pdf
    • http://yonseri.org/userfiles/files/mawakogonegereri.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/bizigunopelov.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tjakl1b5ac0gvbgepd1e9f7j05/14964124704.pdf
    • http://www.moyekolodin.com/files/69430344826.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b92d49f1---85599478100.pdf
    • http://resetimpianti.it/reset/public/file/lenurul.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/e670d47cab2d0834eb7c9c240a753f5e/lugivanukazalorifefesapox.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/wisizadukegujanuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=interchange+5th+edition+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0002484d.bin
7d1b649febf5c46fd33d4c4e135f8db3a018d910fcca86395598516d2fd71a56		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2484D 25504 bytes
font_00_sfnt_off00010172.bin
db3e54dfa3f8d4cb4a935a9d688da1da7abf28207ad7ca3b596a605bf2ebfa9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 63136 bytes
font_01_sfnt_off0001beae.bin
9a3a6e8808e52faa1081cbd5845b418a1f7178df1bfbc8bbd4cdfd3e9d9adb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEAE 5392 bytes
font_02_sfnt_off0001d114.bin
d87079d97edbae5734776a584974fef5ad235079f26406fb1b96cf8971e354e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D114 13764 bytes
font_03_sfnt_off0001fa6f.bin
35ba7b31c5e2b3de8ab0d964717a9903b6fbd5333cd59cfbdb619de4b236cad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA6F 8908 bytes
font_04_sfnt_off00021688.bin
ab9a3ad9d58f634bfeaa17bac12450d06ebd99bee651599ed3fdbeeb66777d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21688 17604 bytes
font_06_sfnt_off00027690.bin
132293f144a0639ce6b0c9926821c93b1037ddb445c6145b81da28a04f4f27b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27690 12444 bytes

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