Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b21922b57a7f26…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 21:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dda01550b43bfb0edd41ecf87127f81f SHA-1: e852c35cb00de3553d77c67e86e2cf10c0809ca4 SHA-256: 90b21922b57a7f2624976ed97ef455efb1648cf8d0dbd3e8a838e2dee5d3d27f
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the nature of the hosting indicate an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/n4186to5pak11smu3km0720lkp/76662645600.pdf In PDF document text
    • http://stpatricksreunion.com/clients/84553/File/vigujozon.pdfIn PDF document text
    • http://all-premium.com/user_file/files/sefobasagofigagefufiji.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/tikusuw.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/39600075149.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e21fff8b6ab---dubilezirakobosuvu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/ximemotibovubumapon.pdfIn PDF document text
    • https://aneri12.eu/res/file/90686630052.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/zozajajalevapu.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/41411305049.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/48087268616.pdfIn PDF document text
    • http://strandedtattoo.net/file/fiweb.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/90666916987.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/fogesije.pdfIn PDF document text
    • http://ropesadventure.com/d/files/supemopoginijuval.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/41eff24ebef6a93648fdb2d5c8fc702f/20099515028.pdfIn PDF document text
    • http://iknow.pl/files/file/lanutamaxumutapazefinim.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/kosuvedolesavu.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/gufimakololotekega.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129483381502---15928666400.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/81859700537.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/64009032260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+shed+plans+8x10+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_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 10744 bytes
SHA-256: 868a55ac829a67b787aea0c095b5a2cceb25adba7c3f63fc249dc9314fe76c23
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 18164 bytes
SHA-256: 1f5071cef9aef015ecf69e54f128d4dadb2eb3d51c08572ea77cd64daac1ae5e