Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bc004b3a9e54ad…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 09:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a9f474c101316398169f4dc55c35cc3 SHA-1: d824d48f303df1f635dcd7edd61ff50fd7e815e4 SHA-256: 58bc004b3a9e54adbc959d1fad5ac8319e79a85303aa08d37a292a0550cc47a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tmkb.org.tr/ckfinder/userfiles/files/jolaximojewunusavagobuful.pdf In PDF document text
    • https://cheesykeju.com/contents/files/32315734570.pdfIn PDF document text
    • https://shaksheer.com/app/webroot/upload/files/wezixaneseke.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/49d1f1d029e3d6618f56dc7614ab7131/forox.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xotekusazododu.pdfIn PDF document text
    • https://pisausakti.com/contents/files/3845238872.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/59512151435.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a86ceefb7---figatetelereg.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/zanimekilebewavalodo.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/84273723667.pdfIn PDF document text
    • http://logicamail.it/draft/media/wulew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa2ab6096---28725577419.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/nudulasalimanujuxij.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/91906483752.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/pemedivefubozunitumivibu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/94067894862.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136294db5af6---dezob.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/vakojesadika.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa565532c1---12790160866.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109071346226405.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/lilukefojazonowazibifex.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6s6i6j1j4dmj1bg2buqm9mrs83/litesomelamijidexaxoxivit.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/duweta.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/difidulekewixo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/68364490643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hacks+for+btd6PDF 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_off0000b6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BD 10488 bytes
SHA-256: 251b54e05d5f4f4cad37dcd64a9e74e3249028237b2ecfa3840b26bfc1c30c84
font_01_sfnt_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 17216 bytes
SHA-256: df66fcc24bbeb49709834933e705ec19a9be28c0d3efe170e1b7eab45ffedf83
font_02_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1