Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e81b9972f3cc5fb…

MALICIOUS

PDF

88.6 KB Created: 2021-08-07 20:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1170a819c64b14fdcc772c74257f39d4 SHA-1: 6f795011faadb4249ac11e44590882b0aab0a40b SHA-256: 7e81b9972f3cc5fb626da885a4a517114d7ab290ec01b4ca9cd067bf708821a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607766ec28afc---26597534629.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b794777974e---45276297331.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/379e389b0ab328fedb4895c8fc4c66c9/fulixudazupizod.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/vuxebefirale.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/kamuxujirudedarikodevexi.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/tipebovazawadirobineze.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3dd7pna3uejes56rk3uf4k9g1h/43463240497.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/rofizaw.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/52844747524.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wuferirojowikironuw.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/84669632102.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8109c3e694019c00c6c7f117ba145365/7120339690.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/zipideto.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/38629839297.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9d88ec7bb43e1bf34050c37aba4bf77a/38440399614.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/57742665891.pdfIn PDF document text
    • http://emeat.ru/var/files/gidemevonanufusabagopu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/rurix.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/58125721317.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607624bad9462---87905270299.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/786e5f4b7a4f5a44e3e4802b5b514a8f/xezugogevigonij.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/pakufivetewap.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ab2582b8---53966021764.pdfIn PDF document text
    • https://discoverthesky.it/file/18315409441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=actores+de+la+pelicula+que+paso+ayer+2PDF 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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 18116 bytes
SHA-256: 7d63b070df9f2ef08ef7547c64c649b7d3cfadf9d2b53d2b39f57dd81a83a5ad
font_01_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BE 10864 bytes
SHA-256: 3366ac1e61c052cbca332a8089b033d096fb7d5dd2703d7f349f6775c64781bc