Malicious PDF — malware analysis report

Static analysis result for SHA-256 712796e20f0c4122…

MALICIOUS

PDF

87.8 KB Created: 2021-08-27 09:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 10c8f9feeaaa00f9f4b721f11aa77608 SHA-1: 5d5ef37ae6809f6fb7883e9034f694925e5b7f63 SHA-256: 712796e20f0c41225dd306d018d85af5ba525c821d481ec766734ee5b42a90c6
164 Risk Score

Malware Insights

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

The sample is a PDF that uses a link farm technique to host malicious content on compromised WordPress sites, disguised as a free download. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to deliver a secondary payload, likely a phishing document or malware, to the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6ddc0cfd5---kereditumivawo.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ab495cf8---tuzavetabegepifutoroxorel.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/malasokulaxogi.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/nulerejoraludorido.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74021a4de9---wataxukagaga.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/44bc9q255gth53kghpb9sb8fut/vetevi.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/24653305693.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4555410d2c---rapisetarogola.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/wunulebitusupakogebeteno.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/xasiwamaruxuzatejodev.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/refoluliniw.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a7b9db8d0c2bc25ee831955cf6dd397d/45606407424.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/54333436870.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/wesuziruwafemagurutapiw.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e918ca5c7---jadizajilewado.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/94910801756.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1943bd844e---ramufevo.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/puvasiteritomunoxidikov.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/79067849340.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42c906f82d---78262771383.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/pononelubitexonakoxedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sealy+and+hooley+commercial+law+pdf+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_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 17004 bytes
SHA-256: 6f745ef1358fcf22545dd70b12ca7891f9b0ad167085ccbfa30d376f06d191f6
font_01_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 10896 bytes
SHA-256: 847709ec118e960635ea5852e8b98f2df1283d57a3528311481dfa668dbc0818

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