Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9fbc86ddb0377b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 10:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fac04345a998007a3401c4f48fda3cde SHA-1: 59f53dd69902786bae02b399a224ff382a3b68ee SHA-256: 0e9fbc86ddb0377b5c4b0999aceb1ee9696c18c39f57820245cff851e2a16764
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=bluestore+apk+for+pc PDF link annotation
    • https://bestofbucerias.com/upload/file/gezonufemiguvuwibexo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aff36b326a---mevarirujifigekeziwemodil.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136309780e9b---25680130024.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/dojed.pdfIn PDF document text
    • https://digireg.cz/upload/64183499241.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72820767790.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/duxulujiwafadefunuda.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01835462c---70272486391.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/51450937408.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408a959efaa---40989071887.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/4872422661.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/19433932152.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/sarade.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/jupalozusifisi.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/puzusopuzivotulibaravi.pdfIn PDF document text
    • http://storemisr.com/uploads/files/xazapodezizowo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c503404ffc---75853068273.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/mizizofukubaburixubu.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/bomesu.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/kuzetizezoxeb.pdfIn PDF document text
    • http://standdominica.org/files/files/76212057653.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/zuwubudeguragimig.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/41465094046.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/692346ddcf11b60eef624f780d28aba0/71041802568.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_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 10520 bytes
SHA-256: 0c9a729803a982b27ec924a8d895e8f7b0e857b1c327f985aabb4c03f867413a
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 19172 bytes
SHA-256: 60fd3e0f7953f4cb4ad938949d2329b286db02c2a167903616cbed1163bc7ed0
font_02_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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