Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4e9c832ba3658e…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 03:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9a8d0bcc91684e3646ac888065622334 SHA-1: 67402fda09ea100704e416737207b86b451f6139 SHA-256: 5b4e9c832ba3658e0de26f70c05832eaed84dc85bc7440cfb7d301f80d83be64
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress uploads and disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=catalyst+change+out PDF link annotation
    • http://araonline.hu/uploads/file/15395113261.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/vepadonatesupolagivo.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9f5f265437ef536299f47212cfe11753/66321954819.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/dekuguvebusaxo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e91f36025ebfcf6d1f2680ce0f200f50/gesomekumutobisozi.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/52531829199.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/354a2e27c2d72b24a7b3405e814bb6a1/84652109573.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ba5cddf09dfa59bf5d6416d00c21d028/bitakesilitemonekaku.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c9696044---tijirebidevune.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/18597356425.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f6e26f90a36b190e0f07863a4219eccd/63158746002.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/pamadov.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/05315c4cffa0393d55437db18558f994/dikemusemel.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608719dbaaa7f---79325547699.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b76ce6b07f8---55599505442.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7ec3785a5---sadejipagesuzikuborepalul.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9ed1044d---povugewepejolawegixofuvam.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/jagotejobowetoxigov.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/wenejipowigeb.pdfIn PDF document text
    • https://mfdesign.hu/files/file/36830786856.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/df4bf46fb84b989426be9f7cac600c70/34688984195.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ssasuaoh715m9hnq012av5id9r/wedavutalojawoporiverulal.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/gelenesakuribusereje.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/ko35iefpapgvqugr18b3m9fv67/vafer.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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 16856 bytes
SHA-256: 252d48ef25d857daa5154c6d5f5d58dfab0331b3fb638427a50a4ede1eaede45
font_01_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 10560 bytes
SHA-256: 3422ce5763fd83d649af4daa87da49e265b285f811468e86068c5a5632ffdb3a

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