Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa4a14ad8286af0…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 00:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d6d541a4e34113e89df7878a0519256 SHA-1: 1886558fff6f3f79722bd46e473106d989acbb1c SHA-256: 9fa4a14ad8286af0257b33d5e103cc9aec1349865552084fb6a9e364835c9d91
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high-confidence ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and the presence of external URIs indicate it's likely designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=process+control+in+textile+manufacturing+pdf+free+download PDF link annotation
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/s601bddej6t7kd5i3n6jspres3/sewokafanadowozoruva.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/28208959851.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s33agnga6pbq7h0pfba6bl8qj5/91696784094.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000a1541a2---61568850438.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/19341730173.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/40239616616.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e5b7163c---92161871751.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/89898955586.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb1628fae4---74207915168.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/suwoxonamedulezulatilu.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/42132069395.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6115c2df0462e02060b00d9c9bffcda1/vowefovipodiju.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16281434392105.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2fb6332e2---xepavezegemodafiloduta.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/filatubup.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/54963591429.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1625648641.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/burulirubewoloremesaso.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd8844462d---biwikep.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/26152075626.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608870d24d848---43419854709.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_off0000bb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 11252 bytes
SHA-256: d938c282701dd815c16df32a7d0558e019df11a74cd3002c14f4f5494e09649b
font_02_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 15568 bytes
SHA-256: dc88b6ffca8a388d523e2a7e4066a0d7e64970bfade90f278bbee03dd974081c

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