Malicious PDF — malware analysis report

Static analysis result for SHA-256 50582b83bb0b8362…

MALICIOUS

PDF

80.3 KB Created: 2021-08-01 12:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 548daca7bce09a5a6b24386c82b1a2b1 SHA-1: 27e9a903d79f6520b9da4f7276cda94e95b74da3 SHA-256: 50582b83bb0b8362e4d3fe6ffb4bd1c04383b963940e39a5b1e95d31fb15e729
96 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm on disposable hosting. This suggests the document is designed to lure users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f45adac71eb1451e230e32524c4d9b6b/tukijopumozawasivukuda.pdf In PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c204de85861---66085831300.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7649d7bdcdd6e3ae8d3f8cb8160936bd/salonunulegiserinopuwuka.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/wasag.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/podekavubotu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9fb35eb79f6a2d22683d3ac71f5cd922/koputen.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608016aea37ae---77611023703.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210717_0D78DB51A22E6F2B.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/susuvazuxadojijazureko.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc83841a15---xozasafediboj.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/xonaxilinavejopagevige.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b257beb8377---88292688365.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/zafazur.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/tenasipisewolo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fec28dc7d---68460299601.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a25551cfb1db2de0d8a407c1a59f05c9/91419712823.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090d16a2b4d8---38193227256.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/93fb240edd0043154fa5b58c9cb4e020/5890679459.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/aedbf9d4883d6d3da6d32f5707cbaa58/tubabuwizadat.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083954badde5---64081665067.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/727c5dc314724aaeb17f3033532af6c3/wumonuguzedinowi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b8158a46a---53666613126.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/83678956206.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/gumadeg.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/mezatini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=que+son+las+sumas+y+restas+de+fracciones+heterogeneasPDF 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_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 11196 bytes
SHA-256: 0b1cf39757551796b3bd90cc5b0049a4a5f2315d79eae50f6ae601f7618bb7b0
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 16776 bytes
SHA-256: 4807795e2f2b6bc22ffd9088171157cc84dd17b676dfdd42fecdfbe7aae69b7f

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