Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1308125c2d1e7b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 23:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 041d720285566f4b6ddb8d53ec562aa6 SHA-1: 62fd7fd3b2e0856fb943dae9ff42bb5f42beb3fe SHA-256: fd1308125c2d1e7baae6033a119ea52c8e206cfd711c86e730f35388d478a065
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely serves to download and execute a second-stage payload, while the link farm aims to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/99tmcmdbjtm4kb395i0d6oluh7/faxijaluxoxukoxujaziro.pdf In PDF document text
    • https://esprimagroup.com/userfiles/file/wofodirilitikidigugebut.pdfIn PDF document text
    • http://renovator.cz/files/file/62196697869.pdfIn macro / runtime command snippet
    • http://architettogherardi.eu/userfiles/files/munosin.pdfIn macro / runtime command snippet
    • https://bluetact.com/ckfinder/userfiles/files/koruzozivino.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3555cdde02---kaxufawuluboved.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/80594774606.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/gofeburik.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de486a98931---sikuwifelisolefasu.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/20770312172.pdfIn PDF document text
    • http://boldogelet.hu/media/68068997740.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab8c61adb---57516715527.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b6c1ac35---lamovovibijowisorebugisu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c059868bf2f---buxura.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/83710867465.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/55637823.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/5361889040.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c9100462---tagawenukogi.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/5648532524.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8c2e17be---81120143695.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c575842f---89207248184.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/27b5cb61bc6ce714ebf84d6f7e76fe08/dozitixizesadape.pdfIn PDF document text
    • http://geodez.com/pliki/file/netizipanumo.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/515789031.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/tesuxunijumab.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a46a6c13912340ca1dbed3638c5fe8ef/42926482400.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/79684438244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=campbell+hausfeld+dh4200+spray+gun+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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 11340 bytes
SHA-256: 0945ac2e08224b5173f5ffe13d7022886342844bbe1dd0987a7741b763a13968
font_02_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 19176 bytes
SHA-256: 1ad19846c3197bb9fb83176d77617b1769bc6c2a6709f02c9d9489c40abc1d2a

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