Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b761137c80fb63…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 00:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1defff568e641eb71dd95bb99b9fcce SHA-1: 26bcc66678656fb785d89a59fc8bb0fa71c8a276 SHA-256: f8b761137c80fb633090df391438d6376327c236ccd379c8bd0b0ce0f659fc75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised WordPress installations. The ClamAV detection and the nature of the URLs suggest a phishing or malware distribution attempt. No scripts were extracted, but the structure indicates a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0798

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5d2ce884adf0b333e27f86b9598a475d/91053206579.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c229c7e3---gimuvimilisofawosuzali.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b70730e8---rejapigebebuvonukebojew.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d45be6530f7---tenemivoz.pdfIn PDF document text
    • http://amandamaitland.com/images/file/bewenudowanuwifexud.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e1612215---745059360.pdfIn PDF document text
    • http://ippon.lv/uploads/File/tafawum.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f1191016a2ee49634e68d9059663665d/76677494.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2d408fc80f057c91892a8d0ceb60c7f0/45441865320.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/7e0003ef82751e1516fbba85ba9d0f8a/puruxi.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/nilubavixejavujij.pdfIn PDF document text
    • http://kleiberit.ru/files/file/10510293371.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/933f1c6b2e8ea4fefc92f3b43328e9a7/newelavovotegelop.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6b8a6da5---mafew.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/nutinojez.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4060c748---titulevur.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0983cab58ebfe6f3ac890623cd16dea1/burimuwawekeg.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/polebomadijovaw.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4687e3615---fimixutabatodowex.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/kenimarunazomolufu.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/19530893299.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/52289d93827561e2b08c4f8c10c0435c/22804397093.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/97550629543.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a40d5c8a2fd26e72dc16c499d6aa7858/70395285543.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609973cd0953a---93279312419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=clash+of+clans+town+hall+8+upgrade+guidePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5daa8746882c3a64283ac4f2e9731cb1/96108648448.pdfIn 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_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 11324 bytes
SHA-256: 6137c4f921e139fedd0616e3ac7baab0115448e498d9d511275674bbb8cb8dfb
font_02_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 16800 bytes
SHA-256: d69e77e5fb34b4e4acb5091b65219492477156a6c5f354371d26bc74bcd3d3b4