Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd643d7090a0ea99…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 06:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 754dc9aaa2e237c6dbd998a7481a5a1e SHA-1: a64c2ad86f8fb185403239852678b1a305ef596f SHA-256: fd643d7090a0ea99580eecf20e4f150b746fc635a967dec5cbcf25cb1211dfc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm with numerous unknown URLs hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d21d09ddb3---titojogapise.pdf In PDF document text
    • https://naveenent.com/administrator/imagetemp/file/70391085869.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/347lq2e0qqam8jtl5n00er41dd/bokunanaxekeji.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/wokojaworoneritapasilekuf.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/debepabemewuvabal.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/pamawafuwiwuzajodafusutex.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/jodiredikefote.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/95482328085.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96439395952.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/vagavovogitopisenuno.pdfIn PDF document text
    • http://space-edge.com/upload/files/18840429726.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134e0e5d9bfd---76976995431.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/baranamudiz.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/10215401569.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/lilawikutidak.pdfIn PDF document text
    • http://web5gstore.com/Files/files/61721276199.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dovejufejevowosokobuf.pdfIn PDF document text
    • http://agavietnam.com/img/files/74041520794.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/bf6e90415579a859a9df38ca884d04ab/50568379976.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb093f334---ribugasiji.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/xuvedenufa.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/mepimibogog.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/18668684362.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/75823564427.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/mevetegiwajupirutak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=12+item+ms+walking+scale+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_off0000bc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC63 16532 bytes
SHA-256: b3abecdd59946479fec2913c6603d9fa51a1289aca81b81e9b74add6eba8c8c3
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 10996 bytes
SHA-256: f8fd307a9e23d7bd3c99e3beaf3be1fdc61a9ecf35ef557825276fac358033f9