Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8369b803134cc9c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 13:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39f2e5e4449b81484f09b8fb24db8736 SHA-1: 97c06016b947f164d891a1b68bf2566a81b44384 SHA-256: c8369b803134cc9c668068e3fcb8e37fa4970fbeb6d309d232b77049b7180e52
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is a link farm designed to redirect users to potentially malicious content. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/883087d78b436ecccb4c168aaa9acfe4/zulixepeje.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a145e6c2ae2---nojobobaj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4b5092479---jivesinodoban.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/652ee69b05a245393e71773a304fcb39/66738705013.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/wetiniwatezawefi.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/wepafabenifazibol.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ad87118f9214e2db64d2de4f21e3975e/11439848335.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10548f7ae---vutiref.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/vozafigoxuxodo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99b635408---87178639582.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/166654021.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e223062f2---nitasub.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/95503236104.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/54443018618.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/bajigosaromeloz.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/nemalubadezusokimez.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/bosoxapeso.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/10588583046.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/zamatawirijosedopuxev.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6cbb2d4695965efed48f9a2b8862c487/zikuneropuzefevaduwifor.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007ceaa708---ganolorufe.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/vuruparojosutufuzalatad.pdfIn PDF document text
    • http://usmleworkout.com/files/file/13187242591.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6d3b1ecd---lemakulixulewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=epson+ecotank+l5190+manualPDF 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_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 10992 bytes
SHA-256: 1546ca38122601c69a62988fdd10783795d114323201aa18a99f44f8297c7e59
font_01_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 15920 bytes
SHA-256: 78ce4d11bdeea2e95fb324632f17d0244a1f0337be32f2bf9850ea9b37c7373d
font_02_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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