Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed381a6703173d6…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 03:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eb1d8ee3630221df421664392a235ab7 SHA-1: b2ac9e128022f5214e45b2aeb90b05ea24b6ad97 SHA-256: 1ed381a6703173d6e2a8847ab4c295171915a62a7c6a2e8093635ed544c5c157
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be hosting malicious files, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting it's part of a phishing or malware distribution campaign. No scripts were extracted, but the structure implies a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d077ac05a---42732555888.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072170c8ec8b---38641848789.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/39ok4gu1cj6jk2rjui9sh3mtug/34343550276.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/bef0ac0e4f45d134b780a71e3a715745/bigesijuda.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210526202333.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160708671ca511---zuxeva.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe60c1f559---84021422679.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fd90483845745f90bc3370a1c8f0c6f5/81820600306.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qqouunm4ptumh89f4je92fk9dp/lokoloxin.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/zaxupirujodonipukukowibu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931cf39d1ac---fozazomomeko.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/729c9430e96ac3f0f36f06baeb227c6b/93329921449.pdfIn PDF document text
    • https://kermanrooz.com/img/files/64375108115.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/sijetow.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160786fbfd2156---95600853477.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3ceb319bb368de39d4409c406231f575/ziniwiseneju.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/aecf4e1852887a437ded2b79cebdd558/60361651964.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609528b9b6b16---23269032460.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/zesurula.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/pagajagenaj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c651ae6957c---lukitikuzunudid.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/sedoxaworejolis.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/4202317296.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/benewikapo.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/99997859187.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/df4cc31c2378ab42d0ac99a0f439bbcb/12065237198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=physical+and+environmental+security+policy+templatePDF 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_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 11060 bytes
SHA-256: 67e27bb7ca612c3ee1bac0759e6e8f3f96c4e12c28ed8318f3e458019b3f7896
font_02_sfnt_off00012061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 16184 bytes
SHA-256: 739466c9c603f46b7f709907ccdacd3bfc5c587b7a917cb8d201eec605c8660c