Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd3fd00903e7945…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 16:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 94d46056edb2281c91698db2f4fbeebb SHA-1: d5825dbc337f239a384e62082330127d3c6ad073 SHA-256: edd3fd00903e79454883cb401e4a06d79743358a58d77c8a3c38b766af6c81e6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially harmful external resources, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e75f543558---38420293027.pdf In PDF document text
    • http://10glazsikeyrosa.ru/file/76319488724.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc2c3bee0f---46651083190.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/4su6n6obue4u3rv04ht7a3tgr0/xogakezofo.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/567899584c7427c958101b59e50b3d96/rarovufibotomokoxu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4a268d102---81310532494.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/54905022703.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac2e6bcb7---zubagakadetutojowowi.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210813_AD10734E87428C3A.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/wodezolutewijuwisenuwiv.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/68855448220.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/82410243909.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/zipekikeda.pdfIn PDF document text
    • https://pindimana.in/uploads/file/24435149796.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa95ac4d63a3632e4cdc1d0c55a7b453/sisilodafovigesuriwekefup.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/58612942122.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/bupenojiwalifurom.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51aed9540---17675138294.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/lofoxukowigixap.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5c6e259e8d03f7a7fccd61b201948b17/zadime.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/forisugevaj.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1491747566609c8e2dd6da0.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161271ac2cdf0f---79990574442.pdfIn PDF document text
    • http://orderkai.com/uploads/files/sososejetavali.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/66547378826.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/gonap.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab972d679---18627477545.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/84087710512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=multiplying+and+dividing+polynomials+word+problems+worksheetPDF 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_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 11428 bytes
SHA-256: 1e00969bd370f7da5708b6d788579d8cb0151d96a2f7c05b9a367c2bb0cc172c
font_01_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 18804 bytes
SHA-256: 221747ef2d37dced7237422b29b33711310a25290f4f0551c460c7df40bb10a6
font_02_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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