Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae8698928adbc27…

MALICIOUS

PDF

80.9 KB Created: 2021-07-06 14:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dec40df34109ec501397676e8b510001 SHA-1: 3e65239b56905d83b01d7cd707b1938b35a5ae23 SHA-256: 4ae8698928adbc2750f1ee5d1562223c8d683c581c040713a101a05420289738
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. It also features a link farm pointing to multiple compromised WordPress sites, suggesting a redirection mechanism to further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e031a7b5567---potokome.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/01d1f68fc1144ba67906d016b595c601/43919277699.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/naloxuvijugelobelufiwisu.pdfIn PDF document text
    • https://waroproject.com/file/kewonof.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210521220515.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/fnuiu5sulqq8fbm6d32v6kggst/sawofeterogokupale.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/ruzudekujajeburexereraf.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/20135435452.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e066b92441e11e95bf8a4caa0f5f430b/datovuridisonoxuvefenit.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/84680284287.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e2eb4cefcc0c21eb5684654bd7b642f/lunifapuwixedetakowejuw.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca5620f75---xeragoxuxilo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ec4ef1c8---14383549208.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/kuwijuguduzisaron.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/5235909048.pdfIn PDF document text
    • http://lukinserv.hu/file/mafajunozuxonopi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160958c14e2fde---revimesugidonowegobed.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9c427a6912fa0a5a9b6d1192f2668ad8/xuvufaloraturebim.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/36938686186.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/mekuzipesatimewu.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/gunilelat.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/seluzigazufesubano.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b6ddb4bc557343da3b0532dbbaa0cc94/9585254304.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3faa7a37c---jufizuzakidenibi.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/mokevewuxivalidadipizaz.pdfIn PDF document text
    • https://subarini.ro/mm/file/lazujikezunevipafetetemaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=write+the+equation+for+ohm%27s+lawPDF 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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 17324 bytes
SHA-256: 25f24b3f9b3ee192880b6048984f64fdcc6d62831cc59e1d604e5ec37494faae
font_02_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 10836 bytes
SHA-256: e7199cece5a176bd6390e13552b01d2f12b8cc92b18a91c70a2ce4cde609ac4a

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