Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbba9ee84fae240…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 07:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3bb093dd922248c95764c4a1b0e69fc SHA-1: bcd60bb4ec4dbc2fdae1370cace3ec6f3c254f45 SHA-256: 8dbba9ee84fae240bb3bce04917e0c52b978735ea5c747a923ae0b55e80c429d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://salwangurugram.com/files/34876246880.pdf In PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tozupejemin.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b66cf7a5---paxolalolitaxabavogos.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e1d5dddd80bb50f94102ccd72b3a6e05/guputusujotataxobadolazat.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f332630bea---54134351302.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/fedefiwitufita.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/verufelazodutulokot.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/4f09e13d61e2662d1c29ead2a4ee6832/1020824740.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0c4d5af1f97464da1af105c909c54753/xawisaruwez.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/af32afbcef9828c941aade6e34dc1dd0/84294872213.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/rewibevotavapuwu.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/dexuzeboxiwaris.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210607040500.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d04e5bdcf3b6463fc2bb9965b2264f7a/kelomubebefolujowulez.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/jiruzodikeku.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbc9c93aa---97928623996.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e4f60d15---gujigop.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/zotujevidafoxezenupixoxi.pdfIn PDF document text
    • http://ossokahve.com/upload/file/keriketoxuzodebakowomalev.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/40026147037.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607721a641555---memegalurisunabaraxax.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/kumexesixupopu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/81735755115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=siemens+s7+200+smart+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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 10616 bytes
SHA-256: a5dcbfb1b7a78d998ebda2a2a85ad62369ecea4584aedd18dc598ae5a8bafb0a
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 18200 bytes
SHA-256: 8c6af78f1e7f07343a5586167631b355b95d0b66ed9b95b034c22dbd52a15fca
font_02_sfnt_off00013561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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