Malicious PDF — malware analysis report

Static analysis result for SHA-256 627c10511845f2cb…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 17:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e891a57d0c8dbca006dcea2fbb7092bf SHA-1: f0bf2f08d108690188a8fe6025212006d14e7941 SHA-256: 627c10511845f2cba9781803331533c495c9263368ebe2cd52b2a5dd86db059b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://angelascanu.it/uploads/file/lipedemenudofi.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331553b2489---fanekanefutaluberalawe.pdfIn PDF document text
    • http://machulski.com/public/file/vutamapejanilumodomawa.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/11179841405.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/90482761715.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/litavad.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/ligamakorideniti.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/navafaxuwep.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/75249104337.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/wewanopatujuku.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ufovolidajuwifaxunun.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/82712585120.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/14649626510.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/madawafar.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/zujumikejufunijeduratu.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/804ecfeee7cba6aae7dfebaa9877568b/zaxemipade.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/bexawofafozoxanobalo.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210904_1B26287F05875F7A.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/vusunu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614264d926278---vorujevoseguno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e89c47667e---dowejedodujugegevoru.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/xirabadifatotujewowexit.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/wadapilezinalefebefif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lock+screen+video+wallpaper+apkPDF 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_off0000bd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 17020 bytes
SHA-256: 30a8eeff58b68816afaa828201421e4a976f8a2f7d565aea6996dbf4a8d98202
font_02_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 10608 bytes
SHA-256: 62168f705c5a2dcdde2a35e71cd9d26f72cf485ba57b837b2a8cfd740a7143ed