Malicious PDF — malware analysis report

Static analysis result for SHA-256 476dd99bf64b3faf…

MALICIOUS

PDF

69.4 KB Created: 2021-10-04 06:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00f1771d64fe7fc361426be18db0612a SHA-1: 1d33ddbf237e359b743e7c58d270ff9ed645c703 SHA-256: 476dd99bf64b3faf62cf7c618c283e1f658a3adc320d676d51b85d7546eecff3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://les-dvorik.ru/userfiles/file/vomek.pdf In PDF document text
    • http://mondoacquapiscine.com/userfiles/files/fujiguse.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/80676402427.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/fiselujimobunazojegebijed.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/wuwijutaxusoduwixeluwiwa.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/zebunesuseguwuk.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/nikitumixebitu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca69250645---91780387959.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155f6e8081d0---56969636672.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/wuxilimumaxinofozifuzegak.pdfIn PDF document text
    • https://cncunse.com/d/files/kopavisuvatufa.pdfIn PDF document text
    • https://choosetop.e-giant.net/fkupload/files/97238631374.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kemoviwus.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/29414317162.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/htq748edguf5amortcidohpci2/ketepukuwolefibi.pdfIn PDF document text
    • http://mfcpavpos.ru/file/4372091139.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/gunot.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/renoxukuwizapono.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/sinufuxizujonivajesekab.pdfIn PDF document text
    • https://linker.tw/files/93607150612.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/67902749916.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/31592370770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=foods+to+heal+stomach+ulcerPDF 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_off0000af87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF87 10516 bytes
SHA-256: ba7326292851b6f3a00f1fec91334190d3e58f34432aa27f5252c519010489a4
font_01_sfnt_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 15928 bytes
SHA-256: aa9130bf02655c4e4b486ad02614ba3bf9ccb174342510a1304330cc32b2e3eb
font_02_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1