Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d605b7873f4deb2…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 19:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60a1179e26ddd00aa84410cfc5186f16 SHA-1: 60ba7ba02e5bdf9caae24f8006a38a8fc300612f SHA-256: 9d605b7873f4deb2d23daa4dd50adde9206ec3d0836e969a253bcf3b69b71e1f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/84641311512.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tv2ri9ss820taq806g2uttrgro/49878252482.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/63767470387.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/xatuvowodiloxejisegozilo.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/pajunaxozusa.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/tareraxetodobiti.pdfIn PDF document text
    • http://iwishop.hu/file/69806804494.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c39152790---tevudoguponolesukobovime.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/fia8v3ru58i06tkr837iumevpt/43891887791.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8f0480eb182afec10d231ddd6cb944dd/68260280611.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d65bdd322bb---mafudo.pdfIn PDF document text
    • https://wineart.online/userfiles/file/zaxidodejuju.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/110a52cff911698bd9153f91039c1690/56495250774.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be8f86824d0---41142346897.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161341f7a5e10e---pamexu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa663ce5afb---83312555188.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/tusoxikariveza.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/vexodisera.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee4198851---77944036600.pdfIn PDF document text
    • http://vaynhe.com/upload/files/dubupe.pdfIn PDF document text
    • http://brlairport.com/images/file/69179977183.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/17703997783.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/10231714067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=udhr+simplified+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_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10284 bytes
SHA-256: e3cb13f70845cbbe078650110b1cea02c047b6f8d7fe54d1bf96aedd49cc1497
font_01_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 18348 bytes
SHA-256: 1ee213f13bae4d30ce3ce89ad5e19e6f0cfd846fe9aff6ac047d8ce8b68974b6
font_02_sfnt_off00014266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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