Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ced40a0ac0456b…

MALICIOUS

PDF

73.3 KB Created: 2021-06-11 16:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 96043cee6119949d9619da429a06bc4c SHA-1: 5b871ee5d44a8003e04a024128c2464a1920dbd8 SHA-256: a9ced40a0ac0456bbcfaefa559df7abece75f6414bf4d9a2efd441c1c8a2719a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=jongens+full+movie+english+subtitles+download PDF link annotation
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5794ad17d9d9db91e2b9176785c72dab/lojelirolu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/40e81e202718cb59cab5e2e30138b3b3/85970412929.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bi8c57cmrtfht4l6s5eofc6lkf/6115875687.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rofp5s9td9rn2amddesbv2nos5/barujapasos.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7q91pt0rugquch83am00msi8m/zejafapofixojen.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/56ec02dd01e94bc1ca4ce45a97c02999/noxawusabogavun.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609499fb8dff6---89667600856.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/afc6egrnqeir8dch2055p2la7c/14860155563.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/ziduv.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/pisisejebilofudasufev.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/99231422730.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/momebelirasujijaraxezas.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/dumatanirikojifiwamatap.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/j2anlkcvpgjfq5ma3ofe1h5ls6/pulukujigujev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 5504 bytes
SHA-256: fdc97cc55ffdc5fee39114e6dbe746803bc0a43c19caef18431fbab578646738
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10528 bytes
SHA-256: f0dacb43689ec7b3b693ad0c5427bbbde3cfa80249417c9016447ded82b90f0a