Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4268fb4e55063a…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 17:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e350e8c05617b6b1afe6307816a3c909 SHA-1: a63772cc50527082fba5db6822a612defc879cc8 SHA-256: eb4268fb4e55063a9a4dca0de809ff76046646180426eba267a1703331c6a348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to unknown PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure suggests it's a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3447161956c35c4e52222eb64b18a259/42330424300.pdf In PDF document text
    • https://coebmsf.com/userfiles/file/gixozuxodonukokadoku.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/lumonufazutigubefozomub.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/zorimakowidanogodi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b40c84ae40---pevevuforezudejojasiwam.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/nuxokusevulosiz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fde6aaf32e1---romalejepeliwuvozagopu.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/39807991450.pdfIn PDF document text
    • http://doublehaircenter.com/upload/ckfinder/files/luzabuzabuxeketesaj.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bcqhlnjeukb011i7sli46opvab/gomijivogamakokavow.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/r2h6lmvf3ldaaftdc1juj6175a/perarojebipalo.pdfIn PDF document text
    • https://tonitomov.com/picture/file/99915238665.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/sofazowap.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/farokufumuja.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/46660246036.pdfIn PDF document text
    • http://staropolski.net/Upload/file/28079898355.pdfIn PDF document text
    • http://minipit.com/data/files/kezufulixizesu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/fb4bcf5123190b5aceb55ecac21fdadf/81571871000.pdfIn PDF document text
    • https://kultmotor.hu/images/files/saxawubuk.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/4687031180.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nar3ckqqm8l1vsihcsnblsmpae/gixibuvefidudibakelilugak.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612571f26fb3b---noxubujogulug.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/xivuroratisogibesapadaj.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/63730149542.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30c62ff1f---81118460210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ruger+sr22+owners+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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 20300 bytes
SHA-256: 962bd6575a76eec1054e66877beedbf0abf359a0119e827a452d031f1599d8e0
font_01_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001396a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396A 10612 bytes
SHA-256: 87a4044c838def0ccf75c25634b85845bddbb08829e11d1690b08628cf706343