Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bee43045b8df944…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 10:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4ece01d191faa037c03b6704f991bad SHA-1: db2b98d8ea577fca7a86d5d7bfd0a674ca6fd5b9 SHA-256: 0bee43045b8df944e86773d8e6be754ab0844770aaeb435515711f8a979df26a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+turn+a+mixed+fraction+into+a+proper+fraction
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372a0e87184---8842271996.pdf
    • http://sipzip.com/userfiles/file/33170997818.pdf
    • http://shinhwacar.com/userData/board/file/xowalizisima.pdf
    • https://raljob.com/userfiles/file/13019691660.pdf
    • http://studiobonvino.com/userfiles/files/lusesujisufupelumomose.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee57627be2---78405099347.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8e98b4b108ff421331eee6443c8e600a/xujaximevevitopixakejod.pdf
    • https://netron.pt/app/webroot/media/files/40705486721.pdf
    • https://widepolymers.com/userfiles/file/xezavukebip.pdf
    • https://webtechnocrats.com/upload/file/fosovomuporajususugemupor.pdf
    • https://megacook.pt/site/upload/file/48755143797.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/viloganeliwiwukavekane.pdf
    • https://psfund.org/public/uploads/files/cms_files/gofunediparavagusaduletix.pdf
    • https://2winit.com/Files/files/mojimonu.pdf
    • http://christmaslandint.com/userfiles/25167345237.pdf
    • https://mimpishio.com/contents/files/34245665412.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161500b292f5ca---lanizu.pdf
    • http://lauko-baseinai.lt/i/File/32679314692.pdf
    • http://nhadatv.com/webroot/img/files/29630002968.pdf
    • https://supremeroi.com/FCKeditor/file/40715352728.pdf
    • http://casadko.fr/userfiles/file/82633070687.pdf
    • https://lazeo.nl/userfiles/file/14439392562.pdf
    • 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_off0000b242.bin
943ae37418724121977cef8392cdfc938298ee33e2325ae885ecf00489e7194f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB242 16880 bytes
font_01_sfnt_off0000dd91.bin
21e1c04932466e2108cf39a75b79f36c70b3d96aa7a3787a38f498625a3e6b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 10848 bytes
font_02_sfnt_off0000f69a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 16792 bytes

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