Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ad4dda0b445891…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 06:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0e7e3e8e0c61e5eb0588aa0eafda84bf SHA-1: d7d1a55da0833f7e6c81ea9ef38fc2057c0ab226 SHA-256: c0ad4dda0b445891b5373e8f1706ee717ee660992341e4def2855c3d7c6f2477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jncs.kr/page_data/file/20210526025157.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d1b75647---wijilamitawoveriwon.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/255d37d837b3a6fc56e4f574b0d57ff2/galupeluredobodobox.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071af65cb53d---12093543908.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/25365173310.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/40062241815.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa166ae81---nilitato.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa47a470a6---34486909026.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608aed19b3c42---nefusaxezifefid.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84ab329e0---31980755379.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/49489558879.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbd5ea608---21165285337.pdfIn PDF document text
    • http://chieucoingason.vn/files/sojarilex.pdfIn PDF document text
    • http://zae.me/datafiles/file/48134709682.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0392be44654d36a0333b85559eb7e8a8/94702688584.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/zidedugi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/19523719054.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/19409772573.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/karexivi.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/pomukevagarokamor.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/2263f54bba28b3f82b1ec06dce3919ec/begegakojofixupoxibi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607885e8a2d48---wiripiwaxobo.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/zumidima.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f51145fda05da3f44a57c4d85e363845/47689347565.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/nazonazuzodabigawuduze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chip+chip+and+dale+rescue+rangersPDF 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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 10708 bytes
SHA-256: 8d9d7388c30b37cd59c162f46f82656834952fab0ff4f47cf397c2e8948554c7
font_02_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 19816 bytes
SHA-256: 23f0d5dec129d86a6fb70958afa7d5c883c7c51587358b99f3883cb9dc118981