Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb6d4f5f98148cc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 03:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4aae8b42e9aca42af53ff398fa6e7e3f SHA-1: 136df1f99612cfd7afc1e610e9bc61d5c1b63394 SHA-256: ceb6d4f5f98148cc5a71f00c73ece06da692f30aa4fa75284035680430ab17f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f230b4096---42258216136.pdf In PDF document text
    • http://nataliashishkina.com/userfiles/file/zitaxariwuvinivu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a0f4e4446---7725568452.pdfIn PDF document text
    • https://ptogel1.com/contents/files/50350263538.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/fesuvejugi.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/zafixixubujekumok.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/rolonobimojove.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/xanixafebexoxemaz.pdfIn PDF document text
    • https://envirotechindia.net/admin/userfiles/file/kijebof.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/19949040689.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/vefaxodamidujugudetuxajan.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138006d3ea4f---7983579005.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/25600058975.pdfIn PDF document text
    • http://espicycooking.com/files/file///71913139840.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8b6ec5f3218697e1a5e530ea41335c11/vupivixekaboj.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/keximometujeturipowaleg.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16138435d04890---raxilokaxawedefep.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/63204553018.pdfIn PDF document text
    • http://topas.lt/userfiles/file/jiwudeboreputaxefivones.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d2qa75r2v50ok92hom94djb5a4/72548715106.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/58178938164.pdfIn PDF document text
    • https://carlojans.com/cms/file/foxugesamatuxejeponuvedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=activate+office+2019+for+freePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/xikuminukumevuruvum.pdfIn PDF document text
    • 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_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 10520 bytes
SHA-256: 1c26a05873f69cbc2b7b44a52916b94449efa7cf5e2fb595dbd1c5547bf9c771
font_01_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 17364 bytes
SHA-256: c116b878a9db16f6a739419167792ffbd01f9de64b7c3cbdf6af8d1df7f5faba
font_02_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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