Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39f8326f128d442…

MALICIOUS

PDF

104.2 KB Created: 2021-07-03 13:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01280fc37fbeb6bca80a400f7ad0f7a1 SHA-1: ffc53751bd92717c32bb9f542f2321856b2f7874 SHA-256: c39f8326f128d442d67979966633d891a4f29aec014eca9d30188fa7a2b9a77d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ab5aaffa8---kaxabusobuzuros.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/utqtchdiotktpo0puqnc7pkutk/ruderuzinujanopus.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969c5dbd03f.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/wadenu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820a229d0cd---65837811876.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/be51fe06e0495430bc66ce15b608f5a0/dadew.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9373ab54---duzusabokeweraj.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/godojubuniw.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/sefekizidubamuzutubegijim.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c613d24788---sejelaverolujid.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b038074b5ac---wogamukasuder.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kigonotopo.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/petonerapalujelijususo.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xarinifiz.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a21db70562ee16cbb612740a36c99f4b/momukirokebozezedo.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/6272541382.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/meriferejomar.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ed89ec56---lugijevanenolonuxu.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/25a434f75486e51291f46758a6729033/59498247015.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ea654fc44aee5ebb9ee6da66a8e2a2a2/tasesumusafanuguxe.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/3c25a6fb184cffdb80af4b93369b8519/kowiragiminujogiwa.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/46075506186.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc5e850e3---90115617988.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/fb33f5070cecef51ef6c8cee8de88339/dafatuzer.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/lunorivegatebugiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=allegheny+river+water+trailPDF 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_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 17044 bytes
SHA-256: ed9fbc993e864db2acdcbb5fe1b786b1186caec07ae5b9e495d90e27713f28f8
font_01_sfnt_off0001642c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C43 10344 bytes
SHA-256: 8777ffae24f3d7a96a3213ce4a0753c9d32f081d284d6fe044175ed87dc202a6

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