Malicious PDF — malware analysis report

Static analysis result for SHA-256 3965e916bfa26d92…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 12:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f03978805dc6e9ff4055d247cd6ab157 SHA-1: 68fd68b13cb25d8e606fb331399f3e8e0d8ab628 SHA-256: 3965e916bfa26d92fb0442c0751f7c650ac12f04080ccab73d82a314c5dcb52b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or facilitate phishing. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://huntic.ru/uplcv?utm_term=labor+law+2018+pdf PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b9769daccd8b5ff0443aa8c445fd4b7c/mokebamaxa.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613565a0abaf3---25651979597.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c34b919203fdf8065dcbb23bfe632a7/68378871053.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f805432e---raradoxojala.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/a819ik9c0vhorj79vq0126gg2r/sorifipok.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/jusofovegiwetedavuxodiduv.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b18768d600ba89937f4a0993bced4e2f/28466037337.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/38128678333.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/7904c9hogm7pq6nhvb4l823m03/vufurevifuporoz.pdfIn PDF document text
    • http://husplaza.hu/editor_up/46688952526.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a92ac680a973305ccb9be09da551a30e/jitexedoxewebakamunoz.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/26036316781.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/bogufolamitupejub.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/nobijonufufapisefamejuzu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0jqrc57bldvb45lrngsrttalre/dalatutudaramuwunogelof.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/lewexuxo.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/befimim.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/75687517504.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/pobuxi.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/54386053954.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/70jir16atu6ujkr132b0get5h5/jodoxeroxemonexadidubew.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/1251231807.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/88303956139.pdfIn PDF document text
    • https://noddy.nu/images/file/vafijurenevovajawufigenex.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ff707dcb88d2493b3598876782433e1b/latirupebov.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071942d5a760---xesusazejewilisizijonizeg.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/39849089113.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_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 17528 bytes
SHA-256: cc44180376d10d89b0aa3d1fcfa163d0581fa284c02131bb3be2957215845e4b
font_01_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCD 10584 bytes
SHA-256: e9bd1465eec9b2679c528efbacabbbf334f6cd0ddec6783fb9ff4a4ed0cf997d

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