Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b878cb1104e7eb…

MALICIOUS

PDF

81.2 KB Created: 2021-08-21 14:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cfe5c3e08a29a9a1bb5e2897b1d5207 SHA-1: c09d66a5ec81dfbb1982ddd96e269e3767e48ea8 SHA-256: 38b878cb1104e7eb93a492616a6dc23a9c4f0af6b8430f8526a796124bb766c0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.puskinas.lt/ckfinder/userfiles/files/10590540769.pdf In PDF document text
    • https://nutricount.cz/UserFiles/File/wafezipojazeboduzujapu.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/bejozuloloxutapoxamuz.pdfIn PDF document text
    • http://feminella.ro/upload/fck/81374084288.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084b68517eaa---91906200100.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/75763181565.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/senafutinigegerisurola.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/57837112502.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/mafadavozitujakifegiv.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/70ea980fc7448c0627fdfb9c499c22af/momomarofagefunarupop.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/jomisidopa.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/57061695067.pdfIn PDF document text
    • https://ckmandarin.com/uploads/zavoliw.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/lezefapumuxel.pdfIn PDF document text
    • https://preciseenergygroup.com/media/38296018745.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/padogupig.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/237c82b6916c59e4a69c435ef1f660d8/ponupubusuxafevagu.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/25520144686.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5oijo8pst07qrlinna1gqina57/fojirosupasibopevenezaw.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/apq78314r05o7ivpf837qbdggv/20048752475.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/dutobub.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608951fa3f517---52931595907.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/bajipidodijuvir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=essential+elements+for+band+-+eb+alto+saxophone+book+1+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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 11168 bytes
SHA-256: 30d968d7355552695f215ea9535da1c078b8bad3cdc559034f8db63e09046a66
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16720 bytes
SHA-256: 2d8aee51692d8d3d2ff8d51e7535098ca1a3b978b73a48f65cec289378e51a1c
font_02_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1