Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddfb0a1a96cb694…

MALICIOUS

PDF

82.8 KB Created: 2021-06-28 08:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 249c14e50c99ae76746d4c0d5f0e978f SHA-1: 7572a0dabc3a5eed0a2480f61b2cbf99e2525d88 SHA-256: cddfb0a1a96cb694280e891678edcf2b5886b84e50713a75d5e5bb66aa2e21b3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to numerous compromised websites, many of which host PDF files within WordPress plugin upload directories. The presence of embedded URLs and the nature of the heuristics suggest it is designed to lure users to malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://irths.com/upload_files/files/guwetiseginarivamawokoj.pdf In PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/41444865413.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/38b6d0e8d2d6285a276203b42bbe2909/befusolasonaridilowid.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jnm02j44mgoiiaa8v34b36ovuj/84152812579.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/da3a1d4799f69c06bb9c5d793a855f13/dokupuwejedo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/sovadowapilu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5678f3f309---penobudowuwasuxal.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8745ea4e---kumaredapuzakabusobaketot.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ef52e396---liwemuxuwaduzef.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78d3bfb20---96597657899.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/42804abf465d35a51b09ddfc132a2dd9/rimilejedofiwatem.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/31076142245.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6f1ded6ad54ac13b0e726af6f69461ed/89296374961.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/66373727080.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/iun9qpqgso1ulolfhmsp482pk4/ronikafovoxifewutitis.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e59c4b18---81886213650.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/nigavuvofoxateruradigut.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/lafigubikeli.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/baxasozuzupajapudupusejo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6110d12d094381cc6539803f7279c5f9/34935944856.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/bigatujudu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3fd574d2---40636275345.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b523cb9b939154dfd775db371fccbdbb/zutemixofigoxaxapapopale.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zavupufefuto.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2b510af7bbe176d65088c143846e94d6/49491855725.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gulutelasaxovolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=306+degrees+to+radiansPDF 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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 10740 bytes
SHA-256: 7cc82374e76ebecb674be7262217d7964208f72c767f9c9dc4a9a8f3bec2d349
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 16260 bytes
SHA-256: df92bd0ad39af0be8a49afce1b1e6da7f736f935a97e37b3ed833aacec6d844a

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