Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe7fdfd978b1891…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 22:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5cfee5468159c881e0fb20080600ce4f SHA-1: 62178517df2cea0e808b2fdfe2fa0b021242878e SHA-256: 9fe7fdfd978b189136cc8a275f75b62f48e8e7d19685fff0b933a955da7b0992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/201a08eea27ed813d597f730b785b311/40006130728.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16070b066ee156---dosiradofujenasalo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bd5ab4f3f---fuxekomaworudabezabiviv.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/lazifedimemanulelo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ad3267158a5c5d1cddde475713c487fb/58285628907.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/pimejomexixo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/79fd275a88eca2f6350c838728eb18f0/sirajegotofukekugodikij.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/lusukotoxizedofunezi.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/54421299842.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f89233bb0---bumodumo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1aipdn86qef41g13l4v3pr7gk2/jomalanexizemuwowikimena.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02db1123b---40758326591.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/f2a8da201c3545b80c17e0c5da4a6d82/tapixanowumuvozu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090a518eda0c---214163758.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb66f08b0c---pewufelizotoxud.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/81056994630.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081501c42c4b---45392662401.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///zafekemofojokodovanaw.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0ed05699f---27103415739.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/77463325006.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/gabanagison.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/86979171375.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd86c51ea1---ginaje.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/ranot.pdfIn PDF document text
    • https://tcremich.lu/files/files/jarenijasomaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ccleaner+with+serial+keyPDF 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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 10532 bytes
SHA-256: 544186eacb54b1c166d3dfc3b3c3893f818de560f07adf7f83236e2115728f7c
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 15688 bytes
SHA-256: 3ba8b5ea5e446d06b26843c94b97bd0dda70e72f3999376689545d2ce8d53c3c
font_02_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1