Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f84cb045b8d8788…

MALICIOUS

PDF

94.7 KB Created: 2021-08-17 06:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d23c18d8bd80518a8a6552e00ae8083b SHA-1: 3d502fa0dc51c4f217aa73e5c1fb089bda0a9bef SHA-256: 4f84cb045b8d878822d37f3735a5c5448f424e31db92d98eb1ca285c076a57e8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by an ML model and exhibits characteristics of a credential phishing lure, specifically targeting MFA or one-time codes. The document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure indicate an attempt to trick users into revealing sensitive authentication information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/10d6f690c130b5d17cbf1da30b6d164b/folekuxo.pdf In PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/bevixamerikut.pdfIn PDF document text
    • https://unosms.us/userfiles/file/wabuxutuwusejatazumofatu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/82140646953.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/89ea62bd8b2b355ad0ce6a1bfe110777/74467613516.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/bexisixolesilotedigal.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/rosudifokerakarozo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1pe8vfobk45baom92baqceg2v6/74011442991.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zenojunagafavosuma.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8pt9j3f5onkjp99ldaf16kuuej/67934114261.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/26077974811.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/nikotawonopesuserupizador.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e32aa2b02fc---51799549265.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8f68549b---57754124451.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e1d4131cf29629b542d7a90e8d2cbefc/mufawi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35445c25a4---12221789103.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098f60921b68---zigiredegojelufuza.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161158f58e73d9---lofurixuxonitixo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49f3f8f05c---loneronutokujenopagog.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021081616454031.pdfIn PDF document text
    • https://citronel.com/userfiles/files/41723758571.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/39625576137.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab4310a92---64111998324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=death+certificate+form+pdf+assamPDF 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_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 17028 bytes
SHA-256: 1ee9c80c464cf142beb2e8f98f389317b946cde994b08ece3e72f80ee944b76a
font_01_sfnt_off000139d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EF 10736 bytes
SHA-256: 40ed2d138dd91048b5c00827b9eae64371a835add80b5151311a6d7785511afd

Open this report in the interactive analyzer, or submit your own file for analysis.