Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c90f369cb8988b4…

MALICIOUS

PDF

92.8 KB Created: 2021-09-19 23:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2215bc84d4cef3e7b7246faaafd11ef3 SHA-1: 4283ba8b4bd4789a58894c38cb821c9b08009a13 SHA-256: 3c90f369cb8988b467fbb3590d2791b58abae011b96d643993de3d12b315db68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=final+fantasy+7+remake+disc+2 PDF link annotation
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/69095798703.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109021457123723.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/fokojemakedimunodizofokod.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/52832755898.pdfIn PDF document text
    • http://itena.si/uporabnik/file/pegejutizowexu.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/muvubuxopito.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315b9da4cdc---43014314315.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/8136402708.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/jinomebejanapigopu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/gavudoku.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/xugid.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/95680494214.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133decf1798e---2892690428.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/97063253225.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///joxunisinesotulu.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/57415955659.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d980bc50a3---90922543350.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/rutononotasuxodol.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/40096041493.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_145020.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/97867802622.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210912232300762.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/dobasisulesaketulitufi.pdfIn PDF document text
    • http://bluebossa.pl/files/file/87559841939.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_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 17816 bytes
SHA-256: f34ffd4004397acc7cf7da217c72e06a85858707bfe43a39c888b7fe135b1ec7
font_01_sfnt_off000133c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C1 10868 bytes
SHA-256: 46e6405b9f58a18f9d7e8225afc61674091c3d241d898325d02f158cbcec4623
font_02_sfnt_off00014cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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