Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11446a904644e50…

MALICIOUS

PDF

93.8 KB Created: 2021-08-17 01:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7dbfc8def454beea4a9cd52e60e5ca8c SHA-1: ac27697b9e1107e11741e0d644977bad0eec6e8a SHA-256: b11446a904644e50b8aca9352d21372174619b46c19f8cd7f103cfef0b2b8073
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, supported by the presence of embedded JavaScript and a link farm pointing to multiple distinct hosts. The PDF appears to be designed to lure users into clicking links that lead to further malicious content or downloads, likely distributed via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.companyforte.com/imagenes/editor/file/xefiw.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b793bd14d1b---karoxug.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f80d315bc---89870970459.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/tubit.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/52346834534.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/98730858670.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e256cac34e---84465050485.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a266763bc2---vemeriminogutomerixo.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6dd024a9e3d14685aaa251278a2d5649/55692927086.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/69417623415.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/dglmjvjke35pc1uk5ttvb8sju1/xuwejozuruzobizekawavopi.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/70350892686.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b903030ab---65348945842.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/53330481518.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/gimijal.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098adc6645cb---35544179455.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/63230556807.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b81f2f27a2a---tidijuvumilapewabix.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/terikuworuzesov.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/kirixipexupesuted.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210724_9CE3209076C55D5F.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d93d35ba1---30693310352.pdfIn PDF document text
    • https://basisnomor.com/contents//files/zoxaji.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1f1d5bd5ae5cf1bb3019c3ccce67bed/xezeloluruxanafoju.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/22216775379.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/76829479442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=como+poner+los+emojis+de+iphone+en+android+sin+rootPDF 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_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 17760 bytes
SHA-256: 1f7c585a6dfeadf73bdfcdf2a25a71e89a10fadb47c8ed2af6dfdc829d6e4e87
font_02_sfnt_off00015002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15002 10816 bytes
SHA-256: f051261e60b4afe817c3234b98828a44de598c1cc3e1057c393993bce4ba0bb0

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