Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b9ca0c643ea2c9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 23:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0457bfd953f9d5afcb29181a7d5dcabc SHA-1: 1fb95445f9c7ee13e6fc79e4f9d667e601e56daf SHA-256: 16b9ca0c643ea2c95fb3e4457b4a1e92412d816d7c72c49277eb1fe0ba1c381f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The heuristics indicate the PDF is designed to host a collection of links, likely for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gzky.cn/dubeite/ckfinder/userfiles/files/20210907_061403.pdf In PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/vixamuko.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tebamivugoleva.pdfIn PDF document text
    • https://alohasafaris.com/files/jemonalinajazafajebuf.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/puduwiwepibazinovotaniw.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7b4bfb68---peburelob.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be840225ce---kofilidi.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/disod.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/48251613033.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26eeca80c---vedanirasudovu.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/68837720324.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/80824896659.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a489dec7---dadis.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/xupotavamuv.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/778b76979113650501e80a7a3d9d7ca9/pexaxenibalesoz.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/somifawunar.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/22390504160.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/18229821375.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/15810925749.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/70039395918.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8ece1bf68edfe484f6ca9d1ca7ca9b0f/42940640669.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/ketipatitipuzagixikukotu.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/fezebep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=my+hero+academia+training+of+the+dead+watchPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12C 17652 bytes
SHA-256: 77b21f43ef5e1121c8a5eddaadd5404211709e53271efe93dec5ea48d0d05d3e
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10904 bytes
SHA-256: 1985b38a07fdab449d62f6d4f18e82900f7845d1616b8b368ffb33c4d4eb4d87

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