Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bd675f3c0dbde0…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 16:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c62fb851b424bc1544eb56d8dcd7e5b4 SHA-1: 044379882fe39c2369197470870d351202d67796 SHA-256: 90bd675f3c0dbde0ececaa657adb01f10ce524b56576d04fba8ef03d7d4299cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082eabc86077---74212593774.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6d50c6fbb619087c45241d9ceafd7f51/34051303381.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/46365552878.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/27096555175.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/40017439767.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6698d731dc489ae874b12a63caab3ee5/pagisatawizedol.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16107754f77c83---patarexevivenofuga.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca1a6cc06---68371379785.pdfIn PDF document text
    • http://renknh.com/ckupload/files/7028581054.pdfIn PDF document text
    • http://stevis.cz/files/file/98270765253.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2ad783824---1046321489.pdfIn PDF document text
    • http://ingore.cn/upload/files/vufefigurowa.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/suxelirezevoleraxedoxaf.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3566d0dde6---susutebaduti.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/82756873690.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/fotoxap.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160db34c134498---84320350853.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46334975854.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/62455270632.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/m88b2jec5ma6nkbji4lj31d3lc/18275300638.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/tegawiwusivivuvotowori.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/mukujinasiz.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/6290758974.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/oec4bqp7904s3p4vche9e9kai0/tivarela.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/82421634491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=technical+drawing+tutorial+pdfPDF 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_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 10880 bytes
SHA-256: 81e8f05c1818ff86a7de7dd5bc1c14634df19bdab1be9efe12c58475ed7df010
font_01_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 17372 bytes
SHA-256: d65867167ef76a7da4ded6b9446ba42bf442a37b844e23b7147cfe32dcbd94f7
font_02_sfnt_off00013daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1