Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a3c2790df9132e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 08:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcb8b27dc8c8ad3303f99f5c0d73ff38 SHA-1: e63f362829f99c45bfa7298ae5daeed6389ef17a SHA-256: e2a3c2790df9132ece8dbc77c3ad7dfc42a03f364008e99361d66c71ba04ee0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://h04ydivan.ru/userfiles/file/sikaxijitetuto.pdf In PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/bigobufidojixamanizu.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/45614735204.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2099684bb490fa9e118551312f518086/texoz.pdfIn PDF document text
    • http://retailcop.ca/files/4553738071.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/lewuru.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/wofifozavexoged.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410b71231ae---21218899709.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/zubedumakulo.pdfIn PDF document text
    • https://fitness-base.tw/uploads/files/202109282231389343.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/lixom.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/zoxoxujiweveburiwu.pdfIn PDF document text
    • http://altinay-law.com/images/file/bonedumul.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/9804834170.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/6816922945.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e898b780cdd8fc55ae84ec1dbf4a28c3/sawuxikifavulasazodepez.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210913095246911138alwfmh.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/34666524057.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/66647758344.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/21563336874.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/84814738431.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/zelowaxosiv.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/verosisepalopuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=harry+potter+and+the+deathly+hallows+part+2+dreamfilmPDF 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_off0000b34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34B 17084 bytes
SHA-256: 9e7114b2129985cdb68618b0b4aff27182f3a6a113df48156bc918fc9a61a7ea
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 11076 bytes
SHA-256: daaf6e08e7a6fde24eb16a774c04736de2768607e549909e47d49967519f33c2