Malicious PDF — malware analysis report

Static analysis result for SHA-256 468b487ad3de7331…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 02:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4c8618eee6cc06874d63cf5438c2307 SHA-1: e96c57bd27d529dd056afe8e2d8d3ccfd3b7d4ee SHA-256: 468b487ad3de7331107a1ce402b95368cb53fde083fa33aef7610485adacae5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://abwlargo.com/uploads/files/92595469260.pdf In PDF document text
    • http://pk.mo/userfiles/file/31129500082.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/6074696213.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/jijevigixabufipotafusetuk.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/sakolirovagezuteteloxib.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160882169e65c5---movas.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sogekejolunivebenelawij.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5b398a11---sonofupakiberek.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/xazumupumusojojokoxi.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/32588033637.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d3ad3abf2c6d8d0c8f68e51725dfbc01/36079145965.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/18832025568.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/15culiigme2n4h68seamcbp4o3/54404514281.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e06b1417163---86112518144.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/bimomofepemajogofumupito.pdfIn PDF document text
    • http://surtek.biz/image/files/20150212_060026.pdfIn PDF document text
    • https://avflash.nl/upload/files/88445380845.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5gs69t3lrc24pkfsf8tp4oj4b7/68981468660.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160999015abf66---fulegozodirarixerojir.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e806b6b45---narebuzetanedin.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/godanegosibane.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/15381783522.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/48597525261.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0bdd723a---801427239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=manual+turbo+pascal+7+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_off0000c6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AA 10672 bytes
SHA-256: a11643d8db41e211d3601db348b3a6ed5765af0723cec3107c80494997a8cb1d
font_01_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 18292 bytes
SHA-256: d820a1f9a7dfb50eda758e35ec256c79833510053dc6af706d0bed500e17b00f