Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed789a62015c555…

MALICIOUS

PDF

81.7 KB Created: 2021-08-26 00:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9841c456076ec28a9843d225d2135fef SHA-1: 45342152016e574bdce0ecfa6f9917ea7ed236c2 SHA-256: 6ed789a62015c555f3d83c8701a6a7708d66222dc53ccba9d6f30666a571a747
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 and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to lure victims to malicious content. No scripts were extracted, but the nature of the URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=the+pathless+steam+release+date PDF link annotation
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b1512580448395e877ffa132f18bdbe0/mokafivodejolurejewis.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf07bb0564---72778330822.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/21854063407.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/eott147l9qi4jt39km4ja26mb6/xanumo.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/wexavojatarejekomerapade.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-29/images/files/10633187891.pdfIn PDF document text
    • https://medtek.vn/storage/file/25911504930.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/704815cc7525ff3a9014015a2c2ce645/dejevetafulinepamixin.pdfIn PDF document text
    • https://argumentua.com/i/file/rumibavo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920c3ec0fc9---bibidepigitul.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/jatuwafuworovifaw.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/suzada.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f16fee235bfbbf3d9adf742f0b64580f/43144878031.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/15284032661.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/81390107411.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/tibijezekuwinavaw.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ekarkmcevhopmd913amtk82h8t/66795440980.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/moretik.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c984ae50217---89996555935.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/62637478322.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/81809612056.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/verum.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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 17256 bytes
SHA-256: 1676d346a791fd4022b26e405efb512f5019f6439e85a30a818c26ebb5c897a3
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 10304 bytes
SHA-256: 1000481b9493a3ce031ffd65115e0407e4c0432ca5304604d614e89fdac59987
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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