Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fd1071d70411c9…

MALICIOUS

PDF

89.9 KB Created: 2021-09-03 01:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6a7e4fa5d2d3558e70f116f63756de2 SHA-1: abcbf744cf2df1c568b6739113683585968e1276 SHA-256: f3fd1071d70411c9db3659335e3f0aa44363c2f55f00dfbe8cf829656351ae3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. While no scripts were directly extracted, the structure suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://mtsskzy.com/userfiles/file/36388591487.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/seput.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/huebnbh96vfudcbh2m5qi2tf8m/10202320835.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162620348966409003909.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/makoso.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/domusajejibow.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7ce8da3ae---dikirifedekiziwetix.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9e9ae2ebc---57376267738.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e1215e2c8ee6a59c8a9050704b8aa403/vazufirisosebafomu.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621542673.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f32831e31---79022163557.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/lujejipogawivanakene.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/mobalejemipamajuvefa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76cad4bfde---tasopukagozunugujidasapu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/72960934334.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/540c40e414df651ae80d96397d3f9c46/90769472153.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///vibenaroj.pdfIn PDF document text
    • http://etre-belle.su/images/file/rozatupavedotozizobuw.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/karagonunixem.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/29903837255.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xepef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=roland+barthes+structuralism+pdfPDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/tavewenugirukipivobadiri.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_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 11172 bytes
SHA-256: 1e308423254a6f87132645b56730213a774984fb0db277611fd43c11c584c0a0
font_02_sfnt_off0001297b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 19344 bytes
SHA-256: cf23e163e7bd025ed1043b714268fae801c6069417b4420faf9710a34b8d85b0

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