Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b8c88089d49dc5…

MALICIOUS

PDF

90.4 KB Created: 2021-08-16 08:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae9446a9584d4a53c3fe9df564d643f3 SHA-1: eb1b8dfe995eaf195a712b977ff0254457d57338 SHA-256: 42b8c88089d49dc50d58033c4a29a976f589dea19fe2c4eb6b8b251fb69bea24
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to potentially malicious content hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0d6865f4---13079643031.pdf In PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/mugor.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/1470171bcf3cecb053b7ddbad3d28cab/13224737310.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160721c94f097f---90587924145.pdfIn PDF document text
    • https://zzwgjx.com/d/files/rufezabagomubinafugu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b61f6c8dd---10930947314.pdfIn PDF document text
    • https://slide-bearing.com/d/files/11201591755.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790a0dda9f8---8487918453.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b68867591b20dba59f479aa068bb3321/lasateripunukuwo.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/33375780741.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/59173063276.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/wutakofibit.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/wizemibok.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607469261f4ff---kawiseresedemadesas.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106280610529201.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/72018853453.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/tt5ggadb48m6r2munspcrm816v/79782236518.pdfIn PDF document text
    • http://888chji.com/userfiles/files/vujeb.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/225574c3b59ef32426f3de46c9313179/23635752217.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/wofiwuwomozitoguwume.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/besazaxosu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a61340fed219060dbd9a736eb3c8d6cb/dapesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+rare+champions+raid+shadow+legendsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 11100 bytes
SHA-256: 0c42221e5003ccbbf710a889074dec1b6d024cadd617d3d8e59d95b62dfd40dc
font_02_sfnt_off00011821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 16144 bytes
SHA-256: d4883d0f9968b683057b4122346ec5578045194aa2347bd55429149e6893c8ab
font_03_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 17572 bytes
SHA-256: e5e596828c61aa7a6f5d4e205ba501e8fcaedcc51058fea841ccfeb780a53aab

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