Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e6e54247231384…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 14:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d37befe95c644bdae76efbcf934d62a8 SHA-1: 9c40885f8ea339f8010d316d3fb742b3b2be1c8c SHA-256: 17e6e5424723138402ccc75a5f47670736fb2a9af0c1980964fe4e4fcd7a0fd1
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest the document's purpose is to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b4681d7c---tomufuzazo.pdf In PDF document text
    • http://archi1919.com/smlclub-files/file/43184461081.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e1f118ab---93640011365.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/siwopagiguw.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/29772274404.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/birulokuvufoji.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/gifikewerefufukar.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wanoxo.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202108251307396414.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/avs508h2bi1t87k4214iqapph0/13890204243.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/428d598bfec9fd91f9ae10705f74fcfe/zazosepetitakose.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16104e8ee7b7f6---27546609308.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/646a43972b5d3f9edb9840729933cf7e/74258917995.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612806c8de546---68355375873.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/61004784454.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/60653744862.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de59773ae23---20191577265.pdfIn PDF document text
    • http://djpress.pl/Image/files/90838376954.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/49482280761.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/24412685264.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/meduzodexixewufora.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/74171203943.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df042b965---78075168577.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/4894704873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=craftsman+4+gallon+shop+vac+manualPDF 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_off0000be55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 10976 bytes
SHA-256: 33693bdbedc5e38be4795b7b264f9c848a808ce3bf6a038fe7355b3a8a8c02ef
font_02_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 18328 bytes
SHA-256: 134ae49b55dd76cc28c306c63621af748f547abd698d7a6fcda69270964df3c8