Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e9f40d6d907e13…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 17:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f1a4ff45c93268c313a7c9ec5c19e977 SHA-1: b4a295aed45e6517d9e82eeeb5810a5af58fe9ba SHA-256: 35e9f40d6d907e13b583c916c80524ad9e5f7162186e53c827f0c8f9b661b817
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or engaging in phishing. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=higgs+domino+versi+1.67+apk PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143e8d556143---61965926416.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/48072631646.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/nozasuzodajituxelofavu.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/43908133222.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/19868567395.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/fixosusigulukam.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109091702525759.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/tigigosojipuporalulepuk.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/bawogipuxibirobizemav.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/dejajonowugoxazobo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/omowabuzunokuvuzopanonaw.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161458054eede5---wepibedalekevo.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/3554237077.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/takexesigenixirinozom.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/74795648861.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/84799100487.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f03ef542579f911a39dfa42dabf7ce4f/juvuvizowetowafolavamijab.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/xexoxa.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/15778111748.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/27553375810.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/23a221475fcc8883fb2a4801b8dafbf4/jewusine.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/fuwezusugexa.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/35174482870.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/ribiragidamewemep.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613941358a632---kalirowewasas.pdfIn PDF document text
    • 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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 17420 bytes
SHA-256: 27a9e17e9add9ce30e6d6c0c8a4a773df59effa6cb0dc6ffe55cbc3758b64019
font_01_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 11076 bytes
SHA-256: 4d776e7d5abbc5e820b10abca7fd300a5493b7cc69142a383d3e3fe0dc18a718
font_02_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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