Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5592da5100dd9c…

MALICIOUS

PDF

93.6 KB Created: 2021-07-20 20:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98882779d34c301f8d3ac21338c370ba SHA-1: e6615c66f902a242ecd805b1b67a088b802e439f SHA-256: aa5592da5100dd9c3008d6c58ba796d4217dcef03a2f27da5aaa4b5f36ed6200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://nessium.fr/userfiles/file/lixexirigux.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a728091df---19070381107.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ad8b0cf7---votagufagenuwo.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/85481015217.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210703_174708_6642.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/582b7bb7b102a5fe0dc765fcdbcf3395/lufemamaburufurupaxamavi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210704101446199.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2c6091b9---86964752374.pdfIn PDF document text
    • https://loctra.net/userfiles/file/jexiwiperanuzavonutu.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/39303480213.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e13870f3f92c21218fd1ebc12bdae195/43088553834.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/8cc3c40e0f0184fd382e2181cbe80508/4070171577.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/24758211919.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/23240483594.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c23c14734e5---xofusafajuke.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/lgachq1qpni697ce93a38u98ap/22956261015.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/nafatoligadomeba.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/duwaxupalotenuxe.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/tejazijitafod.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/90465059786.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871e3928262---74698432474.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/8555213668.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210702_660EEC5193D3379A.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2478361cbd---natenasikabovujapekivova.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df25aaac0e8---56073925284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=world+of+warships+carrierPDF 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_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 17924 bytes
SHA-256: 20bd1f6f6d0941b1fda352b9f40f87c4a5cc982577b039cc84334a313576e138
font_01_sfnt_off00013733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13733 10596 bytes
SHA-256: 65bf82e7bf7a08b0981283d09542e513715265aea6315db8333618ef01d11d02
font_02_sfnt_off00014f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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