Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6440576deb332ec…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 19:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 933c674064551c792c9ae03672ba8b32 SHA-1: 58450c3ecc8ed912d1c327cff650883ea5fa4f21 SHA-256: b6440576deb332ecdfc1f033ba092146e04113052f7d992ef25440247546de12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://huntic.ru/uplcv?utm_term=what+should+i+say+when+they+ask+why+should+we+hire+you PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb44c25bb7---ziwejotetalozefefup.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7594330c43---wugakovuwujabifof.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/82277183946.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/f784ba4cc0aa7353a8b4b0383e8e9e9a/75631106961.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608974a69b729---67874963802.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/46855691748.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/63381321011.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdea8c29846---fovuvudebuli.pdfIn PDF document text
    • https://majubesar.net/contents//files/wolenalu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091a069f3bb5---3832708550.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j27dsmjqjco2c4pkh46mq1fnpk/lobirajajavixog.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/dezusisajigipufezogajasov.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e7ee17c8bafcfa629352fcad42324282/59200042692.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fde9e1b68---bofuzozerugumitin.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ea2ab0594d8711db31b490023a408496/35309371041.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1dc5e911---49301951863.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4a968887---pekuneb.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/39275905302.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/61618399640.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/beralovesus.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6ae86e47bcf8aff458e58d244412ff36/zematexin.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a9334e80---97217608856.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/geguwaguburegikusabif.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/xevimigorowiva.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/2958620818.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4694b9ed9e---30110189561.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_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 16764 bytes
SHA-256: 6001d025812fcb5ab004d31c2f09d6e9b6dcfa79e1e142beb926f935c2b88252
font_01_sfnt_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D44 10732 bytes
SHA-256: e4aaf5cdbd25534b912e7a4d8c7833873fb3fcb7fe445db6d35e5b117362fa92

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