Malicious PDF — malware analysis report

Static analysis result for SHA-256 4472c8e3c1f8f315…

MALICIOUS

PDF

97.1 KB Created: 2021-09-17 00:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5aa40bb612a6807459a5146c2d90b97b SHA-1: e7b3b26c59524fe5b215cc4e007fcbec53618b2e SHA-256: 4472c8e3c1f8f315c6de8d03936ab0ad7386efee15d4d6bc84e0b42ea341678a
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories and other domains, suggesting an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs indicates a potential phishing or credential harvesting attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.mediagrand.hu/data/editorfile/xidopitu.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924ab9e907---86544552225.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140618a4ab97---sokijorifigoromujone.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/12402962303.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/90700570176.pdfIn PDF document text
    • https://norservis.cz/files/files/jitilesabinokilaxefozezix.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/62694734257.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/gakidufegilaluvu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/48413931277.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/34fi1ttbjekdek2a3mt1anthqd/zabafirizagolexubepodivu.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/xuxiwojopu.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/ledivebepoki.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/37082288932.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/jinesegerujerivitokoze.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/713f3971167bb97f46a8da331467859b/40820662086.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/21005585145.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e0dfd5cd00766ccdcaebe0c2da1b2df/ragitutukemawomasetojob.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/40927321080.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/minukolodivaba.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/87840567626.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/giwekutopasifiwek.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4cf62e8e---16400055957.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/zojigarasorelabunino.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/maqurs2hrt0h4fdhlv2h1vns13/buzenogevolazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=luca+movie+torrentPDF 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_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 10300 bytes
SHA-256: 01b2e6df911424e4d2ebd8387a68f0e62cc81ded04d28046c749528d66386153
font_02_sfnt_off0001421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 20184 bytes
SHA-256: a81e3a5d6f33119d3cbdc8e0bd8140e135ae5f0efda880be8f3da2042f941126

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