Malicious PDF — malware analysis report

Static analysis result for SHA-256 052f9a66a0631f2e…

MALICIOUS

PDF

93.0 KB Created: 2021-07-22 13:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11e5de2eb2a78690c6fb3e35321fa4bd SHA-1: 3544935bfaa325d490e29598ceab2c5b5cc06531 SHA-256: 052f9a66a0631f2e6e8d209286fafcd18e3c33bb6439fac934ab07db24bad2f0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a vehicle for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://paramountswimwear.com/userfiles/files/jezipimi.pdf
    • http://austria-ex.com/images/blog//file/10870808838.pdf
    • http://aldara-latinoamerica.com/userfiles/file/lufumefajututonowewi.pdf
    • https://anukulagrotech.com/userfiles/file/pigivajuzowomiguw.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/eb6b48a763e98a005049651b15504da8/28826656837.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c49e8172788217de9db61ad5c365f549/xogus.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16080e46491e24---jumolenujagodewevubofu.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe6e19c1ee---2150113078.pdf
    • http://dahchen.tw/userfiles/files/94537473617.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f4321e817d65cc2f836ccafe8e126a89/sozejeba.pdf
    • https://lasanisports.com/files/rezodidojimadububetanug.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/33b0f2aaf25f9c75ecab920d5eb3450f/bisudoxixufuw.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a80c3d84b---79546704385.pdf
    • http://studiotecnicoforace.eu/userfiles/files/vitexokalafamemudunagure.pdf
    • https://tonitomov.com/picture/file/29689740859.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88512259318.pdf
    • http://massimomoroni.it/userfiles/files/37226165804.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6dae01715---negibojeforesizetufoluw.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/23990127853.pdf
    • http://visit-pune.com/userfiles/file/nagitilufi.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2sjuenc6pimjesmcr8t4k26697/67954738736.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/897758733fe0456d685ef6d867b306de/roxuden.pdf
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/74003412528.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d23f872d5f5---xerelaselediji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=marriage+customs+in+the+philippines
    • 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_off000107a3.bin
0c984a5a07815e3d7ece2806dcf620939f3bf509ad553df1c6e129aaa66fe2d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 10916 bytes
font_01_sfnt_off000120b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B7 16792 bytes
font_02_sfnt_off000138c9.bin
56af22d6b7447112f063eb3f480125a68a709c1308b7c54dc02e41e63bfbf217
pdf-font-stream PDF embedded font (sfnt) at offset 0x138C9 16472 bytes