Malicious PDF — malware analysis report

Static analysis result for SHA-256 f318bf8b33deaf74…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 13:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 080eb26e2425d3346d670d88aa4417eb SHA-1: dace47104322897d4eb5778c6b0aaa443d0c1b20 SHA-256: f318bf8b33deaf742ba2f6e97cb54fbd9dff9a571e0e8c7d0f261fad4e86e323
134 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 delivering malicious content. The PDF also contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable hosting, suggesting a link farm designed to distribute further malicious files. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan delivery intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3143

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.
  • 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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b477ab2e---8975638683.pdf In PDF document text
    • http://jarosi.hu/files/file/javuvusizezuvigo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/pemipiripevuxala.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/kinujove.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/93158823823.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qnqib1ofcgc2spebbc16tfgrk0/29878201475.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/18616165164.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3bea7e9987f4a91546d4c5a393ab2892/21662595201.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabd4cc941---movuror.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/firexasutapu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/kijixuvonisavibowawuk.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c7f77097---xezudadaginazatip.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9698ea7369b521731967086eb975f9db/55030660007.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0041f700cd---74997742651.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f0f66bada---xofinefupufewedojud.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/loganatorukutez.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/xoxaloxuwivi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124af23d2f18---44184006165.pdfIn PDF document text
    • http://ore-processing.ru/d/files/dapufimaxozetuloti.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/samub.pdfIn PDF document text
    • http://medica-brno.com/files/tijorapujizoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lean+production+book+pdfPDF link annotation
    • 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_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 10688 bytes
SHA-256: 59239ecec80e5b4033862c164995e9d3e26036769100bf263dc141e25f24e8a1
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 17528 bytes
SHA-256: cd1bc3b19b485d4eb945756a19d3587408ae407822b6918b0de882828b4a5aec