Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdc4d0301825557…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 18:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 584ea1b2410ae9ba6e61f9a4c750791e SHA-1: d66dd6902a1bfad24883a948c6e7340e1afbb55f SHA-256: efdc4d03018255575dbfb1be1c8fd94cffafab427186d54f8564eaf49c3c76cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://wolfpackbasketballacademy.com/content_docs/58483651038.pdf In PDF document text
    • http://mygiftltd.com/userfiles/file/91890828981.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58fc154ef---57363785862.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/40e81f4024fd7d587cb69409c7f79c94/nedijamipusodiru.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/62920560896.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e869e7124---40403869057.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-13/20210513033002466831.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/85437178462.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/26094254.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/50364311632.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/74890979314.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/36511bc3614e4cda7ec0864a3bdc38b5/fowezeragete.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/ravewemabix.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/kazeluraxir.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/83612796338.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/lefupavaniw.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8c1db3680976cf1a7fe7e439df531e82/vunigabiwo.pdfIn PDF document text
    • http://tencanpowder.com/d/files/jemalew.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/20423540253.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/kapipemuvosisalorafo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bea838d21c1---13371631606.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/jipixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=como+calcular+el+takt+time+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_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 10732 bytes
SHA-256: 9d8645e7e9de90a4c6ea4a132f41e1cd6c5d66e9d867bfb9d976269ecd892a94
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 18648 bytes
SHA-256: 4f325101d6f4237800403437e4cf39e4daabed8b0216f77864cdcd670949a656