Malicious PDF — malware analysis report

Static analysis result for SHA-256 2281f23db56d65ab…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 23:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11ca1c304c90a9091a7c503dd7b6d830 SHA-1: ef931386b43ec7cbae0b45d9a9d0dec14bc1b44d SHA-256: 2281f23db56d65abe43082419d62b060aed3ad09c63c6d0f015bb0d39cf05bd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised CMS upload storage locations and disposable hosting sites. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/652d57cad93d859a9129bd3af0246884/weludekimifupajun.pdf In PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/kefokolapibonizabavudiz.pdfIn PDF document text
    • http://newmob.it/userfiles/files/sasibelox.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/nn15t32h3t5p6lbfo5qf32phlj/81648629395.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/fitewuzuzarasatilevire.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8ea40cd4d---77458122926.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4db43c24---60632217981.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/piwujinifusojafowirudome.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/52702533537.pdfIn PDF document text
    • http://email-database.info/userfiles/file/nuzuvabipifabixunojaduxu.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/758115019.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160764d1d63317---15591391087.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/36632369504.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/rumolaretibusexepunut.pdfIn PDF document text
    • http://chamdure.com/DATA/files/61810244832.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161230aeba6c77---nowinarilekip.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/sajabimukoraj.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92fabf0cca---53368812111.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/tobokirave.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/372baf29d030878304b2a95de709a1d0/63297096783.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/sirisufufaxakimexekijowu.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/pesotivugizukurolofukikij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=autodesk+sketchbook+ipad+manualPDF 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_off0000b237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB237 10992 bytes
SHA-256: 9b63fc3e5e806655be15b31e0a14931dff9f7f15da7b63caf3df24bb5969f772
font_01_sfnt_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 16760 bytes
SHA-256: cb0a9e29f7e45add197cf8455cb1e37be327d51d724b257e885b3908798c8920

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