Malicious PDF — malware analysis report

Static analysis result for SHA-256 587896ef9c4a9c04…

MALICIOUS

PDF

97.7 KB Created: 2021-06-30 23:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8da0476a985cb63011e5c49446e60f04 SHA-1: e798cf9d38ae063d835fb9c6a6323082d1c0620c SHA-256: 587896ef9c4a9c04c2abb758e90da76aa5b3d0269bf730e7a928d3e3bf0c0ac4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'invoice' and 'payment due' keywords in the extracted URLs, combined with the ML classifier and ClamAV detection, strongly indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/0sqdb68mssidnvt6p59j42dkgb/sekuv.pdf In PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4cfb7dfebca91b8181cfa8674c661e1/pifapew.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/63806071170.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160caf0f369904---42309974067.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/89oceta0k7lue238t9pti9ddgn/vajalazutariwuvupiled.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/57b214b6ed6413f8730dbda95f928cd2/41885519014.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789264c6908---vivetebesuromevifomobu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/48925559822.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/69264811601.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/58452938819.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/32441209248.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/lujaviwarosivubo.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/zewowizukubifemiluta.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d26e0dd93f---33467854057.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/folewokix.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3ca491eb5---manuwit.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/paribumogolisufopupavot.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dtrgopvs8bev74jfob09rana1c/milazasiwexoxadulozodore.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7066f1aa---zilijakufisosuwuwodevo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97904afad---89475247587.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c587fee7ddca8d0f2f212c52622c6c0d/11171133338.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072e62a34dd9---39253681583.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc94249632---72802539204.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/211fe42e572363f34a6779eea3231824/59501057454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=payment+due+upon+receipt+of+invoice+examplePDF 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_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 17836 bytes
SHA-256: 671e3a9b32b440f63b8ac450d7ea46c9ec93273988c3b0b6d7fe29bb2d1043c5
font_01_sfnt_off0001478a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478A 10996 bytes
SHA-256: 57bfd2802107a08d9d86a95f41208fff09db39b1dc01b12b64d0b2c4c39dd706
font_02_sfnt_off00016117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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