Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb81239014ce7be9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-30 12:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb1ed8fb8ed784c15d6c0c40e212de14 SHA-1: 4cdbad12cc46f8093de27aa1cf5d2a92c536e62f SHA-256: fb81239014ce7be97f44bba366b8580ba452653917f6c02db18e09f626e038e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ptaki.info/imgekoprojekty/files/45442768530.pdf In PDF document text
    • http://fjzy18.com/image/uload/files/dexujonola.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/kiwojewobeno.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/fagivo.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/96154036003.pdfIn PDF document text
    • http://15881588.com/ckupload/files/sawopalonob.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/bidipobutelexowejememo.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/50861522002.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_5449CD32985E3890.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/15574339414.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/rojaxukunavuvelejuwone.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/pibepemalosilujefekalol.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/13319883127.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ce201d7f70112546bd7844e82568b3ca/61379895692.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/nejewidawo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132468f0fc31---tuzikoromavazodetore.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614792ac9a8b1---70128385410.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/pokamowa.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/winalolusoluporovixar.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/56194993991.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/nuwinupoposibezege.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f58dab1a2---91375371642.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/7564090749.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/lavuditifibakapijofivuzos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cara+cek+ip+handphonePDF 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_off0000b60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60D 18804 bytes
SHA-256: 8297df2fa2f4f3c9f964229fef794e4d4a44ffc9879226c8e879a9e0e8675d72
font_01_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 10424 bytes
SHA-256: 9378a07937068e4f1ba0732b5ec8327853f536e4c797b6708071cd9f92ab8c78
font_02_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.