Malicious PDF — malware analysis report

Static analysis result for SHA-256 237b6cd13e487d93…

MALICIOUS

PDF

119.2 KB Created: 2021-09-06 05:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb3ad9161732b736207b0605c137523d SHA-1: 7d327bb752772e2dfaf9ba81bd4556b735b93832 SHA-256: 237b6cd13e487d93d4c8b67b8ad1e70e035dc944708927b5f095b62185d38ebf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely serves as a lure. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites, which likely host further malicious content or exploits. The presence of numerous external URIs and the nature of the hosting suggest an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://meyergarden.com/ckfinder/userfiles/files/xazafi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c2fa71977fb7347c54d384ec0d27ebd/96678869073.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85cc34d30---44539739859.pdf
    • https://takarasushimn.com/userfiles/files/55864887981.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608068769e5cb---ponizo.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5ed787ac2df1af4dc6d1b41c4c85e327/2166652149.pdf
    • http://messtores.ca/fck_user_files/file/nigijukifibi.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/munigawo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/27bf75878c824a422fb133810c938ba5/taguguvesan.pdf
    • https://isleo.com/i_photos/file/10533584161.pdf
    • http://orderbestwings.com/uploads/files/93696202197.pdf
    • https://sistemagestiondpr.co/userfiles/file/rebavikogazaxelezekunutik.pdf
    • http://sbcnepal.com/images/file/69239400263.pdf
    • http://omak1968.com/clients/71178/File/wujir.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/getolunupeb.pdf
    • http://czdashan.cn/uploadfile/file/2021090110100973499.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/rilipilemivojoju.pdf
    • http://2440027.ru/upload/file/pojefafobod.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4024c85f67---171179592.pdf
    • http://stinpo.com/ckfinder/userfiles/files/72204521260.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098abf6ac42b---vupavobixegopubawaxob.pdf
    • http://4bx.pl/public/file/fapatijololiladofujipeb.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607521cba1682---21490558893.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5e6321f1b703055252f8e7d17dbd9be3/desemanuxepiwoki.pdf
    • http://travelshops.pl/userfiles/file/2465894945.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc12c82e---xopifevujefiziga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=iskcon+desire+tree+ebooks+pdf
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163a0.bin
f497f051bbc89830ebf66ef7838e73c5339cacb626ad1e87e816d9159e561728
pdf-font-stream PDF embedded font (sfnt) at offset 0x163A0 10588 bytes
font_01_sfnt_off00017bb0.bin
de356b38c6d7a81eaf2957ea85f69b9d72da5cb34bf1c4952b18154539d21526
pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB0 22924 bytes
font_02_sfnt_off0001b687.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B687 16792 bytes