Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb6ee10a8714608…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 06:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 49a1519a49cf1c48b85e7ee8b1feb75f SHA-1: c786baed84cfe783908e98ee2f5f189cca69c412 SHA-256: 5bb6ee10a8714608927403b1decb47d215c5c2533b6f50c5b9277181f45c1edc
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links, some pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. Heuristics indicate it's a link farm and a lure for MFA or credential harvesting, consistent with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://fultoys.com/userfiles/wumolasimuzizebilosatopi.pdf In PDF document text
    • https://marbletreasures.com/uploads/image/files/84761989508.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/8858027488.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/xikabovev.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/837nvghid1er3gllreubsd4198/daviwozemuziferojafek.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/nerudeg.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210912224957.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/sunalofuve.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/36980794583.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/5702062762.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/dunomugetexegivogoru.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/41272722291.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/ponuturuvisevep.pdfIn PDF document text
    • http://www.celso.org/download/nolenezodabisoratoxawu.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/moruvarijidolunolosidu.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/51998006220.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/kewafubofuj.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/37676208456.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/15553793752.pdfIn PDF document text
    • https://onlinendttraining.com/files/78544868966.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/vizada.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c99c433e---48497827050.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/ribijigafososi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130711920065---67588002270.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/vanuwuzibabusakow.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a51b49258---xafufovuvavel.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/wapupitukakosoxizuvavu.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/kirafozotaxunesegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+retrieve+memo+notes+from+androidPDF 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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 10612 bytes
SHA-256: 25f2ce42288b789c27d557a9a13401981f3fe96d719c14b21273a72ac4f1e92f
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 18208 bytes
SHA-256: 494560fa6b5faba8ae8a92380c9234ee1b6645b2d6317b991fa63ebb1520c899

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