Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c75b53894b530c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 20:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c00b5abce0743e51478f27bd8e32b56f SHA-1: a88ae54977d9b7822f55c03e934d4def0a42a5f2 SHA-256: 59c75b53894b530ce827ff6cb56c13d74acad1503a4c25938e3f3659cda3e16c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://philabc.ru/uplcv?utm_term=nachi+catalogo+pdf
    • https://jagamimpi.com/contents//files/90188872324.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d900a1672b---10780980047.pdf
    • http://antifftech.com/uploadfile/file///2021050312583561.pdf
    • https://suksesunited.com/contents//files/31805903182.pdf
    • http://casadiriposomarsala.it/userfiles/files/32863899576.pdf
    • http://onnetsolution.in/userfiles/file/debexujunopuku.pdf
    • http://vector-mebel.ru/uploads/files/doninalipimexorotib.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f81cbf90r7435hhcadlisk9n52/52758054075.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff938641dd---97113713338.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fcc703281---tovuwanizedozel.pdf
    • http://chizclean.ru/files/fck/file/tikokikot.pdf
    • http://fitviewer.de/files/file/29931713827.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/79b6733ce5fd6127d50002625af1546f/59603782045.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f0585359851ad49fd038a8b4d9f1af5b/98516335509.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/79704591445.pdf
    • http://villa-carlshorst.de/sites/default/files/file/8721596409.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/8lie8g4c9eie79m2ac3odqvu71/jevitadoxatukovap.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/tojiwusidis.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kitozoxakesosimegipebunuw.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd77daf091---40623490643.pdf
    • http://icsbc.ru/fuploader/file/98333544361.pdf
    • http://computerdoki.hu/user/file/lasezisukivinep.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/s34g362rkrjsqqmivjvd60bh43/19024480106.pdf
    • http://stjconsulting.it/userfiles/files/zexobinajunojibina.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_off0000bb6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 16792 bytes
font_01_sfnt_off0000d381.bin
713f6488831f94a9d285d24d030a0ccd086e228528d99c7130b38e10afe2c161
pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 20208 bytes
font_02_sfnt_off000107f7.bin
02bcb5e51f430421a4244767a3f4accc08cfe5ad1d524b5fcc1acae03be2b928
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 10372 bytes