Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc637dfd666b2a89…

MALICIOUS

PDF

82.2 KB Created: 2021-08-09 14:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a6a9a7623e835dbc4cad36163d97c98e SHA-1: 57a7d2413a8f55d0186c4d2257a8acefd82b2dc9 SHA-256: dc637dfd666b2a8978d03d3d5475a994327d00b6bda6509ca7f0bd7d6cfc44f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c8ef0eced70aad6f303b354987b0c9a9/98555361103.pdf In PDF document text
    • http://margheritango.it/userfiles/file/66428667268.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s9tgmfhjbpkicf12g1cdsi7978/86066459234.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/36031431905.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/34598892628.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2106fmepgk70fr9jr12pm1c3lp/pikarusavawejesavukag.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/mukirefu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4d815bc55c4614a4081f0c53d014da49/91530370461.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/947400375.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/vawamin.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/piwelux.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/jetabadesimirid.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/98031604825.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7dc9bb2ed---81394504526.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/dipub.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/20262494124.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/12139244092.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vuberanerarumejotawal.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ahrdbi8s1ie9olrfuboni7b4d9/wifizalinajevulelapaxa.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/68303529991.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/3fa58e3bc0aca858ee842dbc169e9c20/mebojurokofoger.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/fugofutegasofibuwugij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+your+name+invisible+in+pixel+gun+3d+2020PDF 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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16608 bytes
SHA-256: d900dc68e1829ea3661b28c4880b2a422141f1ad3a4a5ddf26d1c274869fcee3
font_01_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 11840 bytes
SHA-256: 7fde55d3ff2c4f08dd44c638257a5c6cc7047125e1994c0b909f99c224e664de