Malicious PDF — malware analysis report

Static analysis result for SHA-256 212a9cb679d57c75…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 22:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ba9330fca8ba3963a56cac1c7131880 SHA-1: 5b9a213723f07080cabae2794babb928c5d3b9b5 SHA-256: 212a9cb679d57c755ed6ce75270c983bcb6d4860a72be5a4cd41cf75567dc24c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/pogenivoxeluva.pdf In PDF document text
    • http://heizler.hu/files/file/48814917904.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210726_1A67421969F9462B.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/ritejut.pdfIn PDF document text
    • http://camwater.org/media/files/5526899137.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a39145edf60---64063765302.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/juxififed.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082643f220d8---3554991832.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/73393994850.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b1ae7146c9b9fdce8453ec829c000970/57389049932.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9f03b8c64c5ec9e911b494833036b61b/mevugomagemonil.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/okkfi9fgtcrhu2ulkbgbqst39s/gevipobi.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/36398508486.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/wokavimenofega.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cc1a9aee3afe70c791144e64ec8ae9d4/zojanegiwefit.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tajizeroguxelib.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/1207456645.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/81988528443.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/69706502139.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cad664a52a9fb5d82c90f2dabf5d3f32/ruwotunowi.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/10f47ee4118527308975cc58354a5d03/doxugutejalifakavelej.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/sibiwelimewizuwe.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/79643067735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=distribution+management+book+pdfPDF 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_off0000b9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 15040 bytes
SHA-256: 99601c01f8402d44e3a5de0fbd8c66a5e2bb90bf7e823b0c1e915ce5c8fc7b1b
font_02_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 11128 bytes
SHA-256: 079e6e7b960322ada950e0729163b5f359af2bd516456bffbc5b9033403441d0