Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cee08ddd19d2a5…

MALICIOUS

PDF

99.0 KB Created: 2021-07-17 01:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dd757fbb88de708da959d5349d712267 SHA-1: 8480faba613a953079d4673f1ff0ad4abd43e274 SHA-256: c9cee08ddd19d2a5f3ff86cd368e1dddf15353f7708a4c552d2d29e2208ad994
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as potentially compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to external sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

Heuristics 5

  • 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://enjoybowlramenandpoke.com/uploads/files/mumafuladaduni.pdf In PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/sufiraxig.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/97188851479.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/93600846466.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65cb276c37---427021459.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081088724ae4---fezetojovakivulaxavu.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/63578087209.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f33c645a---83293617163.pdfIn PDF document text
    • http://rayanchem.com/d/files/43909047618.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a660ccbc734---87939468279.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dfp3aqtqpp81iompcuedvp8p04/91160433231.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cvehmlke2jsqj5b1pho6ijg37/83940387986.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xipaxafutujeketuba.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/14095465914.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3f4642374aa83a3de62de9ed69b2534a/pudefeni.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/80105553209.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/40084601470.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7183375192---webofofoxopajumipaninuxa.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf794184bbb---95798619195.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd31ab7062---mowebuwasewijadikuvu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebabc4bb0a---ligebojegemawu.pdfIn PDF document text
    • https://ikansambel.com/contents//files/28221039417.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608731ba7db69---58308987110.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608637e7e84a1---niwokefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hmm+huh+meaningPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b074b7cd000---xixoxunol.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 2112 bytes
SHA-256: 9e6c4cdcd048c4e0ca36712cd815ac6ba7d2e6f3512109f592b5e217afd97498
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 16548 bytes
SHA-256: 6f598953370b8d087e9c9b0b25e369b077f0bcfc439cddca4925c531257074eb
font_02_sfnt_off000119b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B8 20920 bytes
SHA-256: 051462e5c7024313af90d28adc0ff6540e0bcedaadf34905d92efb2a71adff1f
font_03_sfnt_off00014db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB2 10112 bytes
SHA-256: cdb82344fd252e07a63c39288a55666d134134351b617b28e851f4e9191960e8
font_04_sfnt_off000163f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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