Malicious PDF — malware analysis report

Static analysis result for SHA-256 25105e5b1cd260d8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 07:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 534b937e64195338b260a9ea14d25c1a SHA-1: d9609a4c2b61cd68a8a55dd48a011ce95d69bc51 SHA-256: 25105e5b1cd260d8e0550c3be62407d17abdc12945004eb155f8a1eb9a668987
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or acting as a link farm, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the overall structure strongly indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://catamma.ru/uplcv?utm_term=grendel+by+john+gardner+chapter+review+questions PDF link annotation
    • http://studiodrago.eu/userfiles/files/40990874404.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b61218662---27021707918.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/37012968028.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/gogug.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/82482111643.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/71666261262.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55247defd---pomep.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c9931fc1ab9553196e16b7b5e63969a0/lijasoxela.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/69505006842.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/xaxudas.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/revozexijo.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/52708827754.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077673d4c502---xulezasilepowobobimi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb6b180ec---kuboxewusinosulelufajikin.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/tojijabuzoz.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/99916928922.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/58549097257.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d420455a1---depubevutesozakigap.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/11813077011.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/91652379502.pdfIn PDF document text
    • http://wamer.org/userfiles/file/fusabuxowe.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/78601839030.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc901e53a---26600579992.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ba8bea36---28528317162.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/mobijafugoxinanusanewa.pdfIn PDF document text
    • 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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 11616 bytes
SHA-256: 0bc91dfd5b3d3ae997b7d9c0d374550a760f615f2ab4c4897f8507ed9cad28dc
font_01_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 17792 bytes
SHA-256: 7493b567a8571466c3a4d3a4da24699c3f17dd05c5e340338c0671cb688ed183

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