Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7d34b5fafafb93…

MALICIOUS

PDF

87.0 KB Created: 2021-08-11 19:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b738195624225d2c9a445353e7c0d0a SHA-1: 71af400f8167e773191be0ed9f103a27b0db6cc4 SHA-256: 8d7d34b5fafafb93b801d1c9c986de27f04927f937e86ac872b4f0180d3f2765
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The presence of heuristics like 'SE_INVOICE_LURE' and 'SE_DOWNLOAD_BUTTON' indicates a phishing or scam attempt, likely to trick users into downloading a secondary payload. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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
  • 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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa05bde24---lasaxigetoboli.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9pbj3qdse3qh28vmiqckctcj9/joguzediwarijivixo.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/t7sgo30o4mvl2j7gqo17lg4hjt/suzavupajinirofararu.pdfIn PDF document text
    • http://stevis.cz/files/file/11290991840.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd33517dba0---lerexaretek.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1ceaf305---wepeziziwifolunose.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/dajapuwelelagiwowa.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/raxigigujeso.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/61039334752.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/49691730822.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab83c2da8---73259745672.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/guzafekudivejeled.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/14288472705.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed433d4d2---15511395211.pdfIn PDF document text
    • http://dnepropress.net/files/file/mevopo.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/rebuluvab.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ba9df42e---zigiwovefezakawujon.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d1a0ba9168f18dc8229562d447cdd77c/zinukafuzuk.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836f1f81ad9---153234526.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/80bb20ecff37c330cf19f24c2d8d4956/zudufeparikugemuzu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f7b58f58c562c9b8e26feb970184fe61/93215434199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=assured+shorthold+tenancy+agreement+form+free+downloadPDF 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_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 16572 bytes
SHA-256: 16853698ac1827ff5ed2f5dfcb22b200c50c8c301107ecd70728f96464a23623
font_02_sfnt_off00013433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13433 11112 bytes
SHA-256: f03a19888cbbbe3ab61416bb36667b98443eb75d495c3899a0f4ca12814c3eb8

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