Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcee7a06a705bee…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 20:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7a5c720e02b5ed60135c047c6ba346dd SHA-1: c2cfe06948cddd20b48e1f2a143462c2b511569f SHA-256: 4dcee7a06a705bee09283d970831055d01631a9b4a5bfa52d05204d8455c498a
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.halpellet.hu/userfiles/files/59978777701.pdf In PDF document text
    • https://fleseriuassociates.ro/files/file/91092834243.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/28060567040.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/38606179148.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/30724117887.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ade01b907---55383091286.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/ziwamutusopifeke.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/52071951874.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/94993924308.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c72fa67a5a51413c522c2c5b744f78f2/5399490999.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/65757060684.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/rozaxatemop.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/65373629391.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/2533701743.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210907224800107278.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/metuka.pdfIn PDF document text
    • http://flomojapan.com/upload/files/vimozejakagaf.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/26917841263.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/pabewipofudexudogodeb.pdfIn PDF document text
    • http://hidramaco.com/files/files/52088427643.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/xunit.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130a6d71706c---gakujajuwirikuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=odisha+b.ed+entrance+syllabus+2019+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_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 17576 bytes
SHA-256: 1d163eab41892c14e3815b8927f0ea42af268a2f82413c1df4c053cb723eb595
font_02_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 11504 bytes
SHA-256: 57bbc04127ec4dfc949d60e833ea762da66b5361d28d28820f16e24567483df9