Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfdd4e612346174…

MALICIOUS

PDF

97.5 KB Created: 2021-07-02 04:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 458290043f33bd9afbc902a6c7140900 SHA-1: b534ffa454b0b1949979fd6bd40ba186433cd232 SHA-256: dcfdd4e612346174efc567da6bddaee53942547254f3f693eedc0a2f4c115a2b
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress installations, acting as a link farm. These links likely serve as a distribution mechanism for further malicious content or phishing attempts. The ML classifier strongly indicated maliciousness, and the presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=that+time+i+got+reincarnated+as+a+slime+short+name PDF link annotation
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609151d6db802---86980199093.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b945d4132d0---sikikajutifawuvuxasufulen.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/63031244217.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/6048872103.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/903f7c6142a0c2cc0da64f46568ea39b/bupoketajipajereje.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23a630604d---vivenebeze.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/23688763113.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c4537fcb6---sidewumubeda.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a989f83c---81778100803.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/93007914324.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/51561160190.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160893dce4fa21---83752230610.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fae89d2b1a3d119d04d08d93a0ca3d10/91047537351.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/gvoj1gmm083go02evqqcl3s46m/fesoxuzubofigule.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/nenonenabitorit.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fc19d113f---jabidowad.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729724d9495---wuvatagozefilukavebesel.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9d53363f0---voroteralib.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c863348fa0a---bizovororopokukatonewowam.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9np7l2pmam8lsogtqfjpnlv0ho/74102578317.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/dadimuman.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/49327317291.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0fc081d0bf72b555022e65c3f2ed5435/fiwekexefonolixez.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56063185e---datawefopo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b075f8d971f---9306680121.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 10780 bytes
SHA-256: 3e356e4aec31a568afc58534bbb890b3729a152cf64a2960c13cebecbdef102f
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 5196 bytes
SHA-256: c455f1667f8aa1c9c431cce9ea9ef5ea09760c7644d9970e5a0918fc3b2485d4
font_03_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 17108 bytes
SHA-256: 838d993696c8c7007ca66106327a8b0e532392702a0efb7fda31493c05cd006a
font_04_sfnt_off000161de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161DE 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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