Malicious PDF — malware analysis report

Static analysis result for SHA-256 2008bb431aee18fc…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 20:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b21aa2f6e1a8bbaf293bab4eae1ff1e5 SHA-1: 177d7e963a2739ae6ea1cc239631ca24da6f79e1 SHA-256: 2008bb431aee18fc9520913a2fddf4a91713d6d03933b69f211a03e773a43b20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://terhautz.com/upload_files/files/19203318142.pdf
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zajodoniridotixoza.pdf
    • http://pc75.net/upfiles/file/1630522814.pdf
    • http://nhatrangpalace.net/app/webroot/upload/files/sovekipufamimed.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/sonud.pdf
    • https://nucamsa.es/userfiles/files/39819757055.pdf
    • http://captaincook.hu/userfiles/file/netokofuwe.pdf
    • https://websbag.com/uploads/files/binagobakiliwix.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/24778975922.pdf
    • https://lotusmarinevn.com/upload/files/85532417595.pdf
    • https://branchennachweis.eu/userfiles/file/14638475075.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/livasad.pdf
    • http://highendschmiede.de/highendfiles/file/75685201054.pdf
    • http://studiostocchi.eu/userfiles/files/49962906235.pdf
    • http://ocean-ex.com/images/blog/file/59387976786.pdf
    • http://shijijiaming.cn/filespath/files/20210911061124.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6df84ac4---18869850425.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ldraicdfcg00o8qbm4v6fnfcjt/guvidonodonabofin.pdf
    • https://adverto.ee/userfiles/file/dajabukalotur.pdf
    • http://tks-forever.com/upload/2021/09/04/file/moxexapebuxo.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f995e8089---falapisarifukinatigovewor.pdf
    • http://turbotechnik24.de/userfiles/file/modizipixiforenedan.pdf
    • https://fa-vietnam.com/webroot/img/files/tobojinopekazop.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5feb63573---tolunenivotekafiv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=drift+max+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b370.bin
565bb3d22a6bbed7b7ecc87eefa4cd15b846e460715ba8a89358160a9633c0ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xB370 10404 bytes
font_01_sfnt_off0000cb03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 16792 bytes
font_02_sfnt_off0000e315.bin
b6246e19bc9dc86eb68cf67a75e6bdf3c4d014ab0941ec9046f15619a3d969c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 14676 bytes