Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3409384c82897a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 19:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43c3c60aad460d7d9cd97bd7e6ccaec8 SHA-1: 90e4ad959078d831d7775063d26b6ddf9847ac32 SHA-256: 8d3409384c82897ad07a6545099112e52f9c376c4f96d9c9ddefdc13248e2fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic highlighting its role in a link farm. Although no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's a delivery mechanism, likely for phishing or malware, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835e300d63---segijalugukofajajejan.pdf In PDF document text
    • https://hiperaktivite.info/userfiles/files/momagafavabufopotafovazav.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/69e3272ea6fd2e50a73a95a07e2cfd56/56656567987.pdfIn PDF document text
    • http://cortabellanews.com/userimages/57828481398.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4f4979276---71941809037.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/judajemalune.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/18487117299.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/sawovakuvixuvuralevexijig.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879eaa8be5---21690223027.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/fapemuxedixekew.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7699730eea---kukigoluxepojaze.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/nakevuxudadizux.pdfIn PDF document text
    • http://eventechsite.com/files/files/direvufulesubam.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/kafujidapiletururokiru.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/98781971950.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4de49e9108d12be3f7ff76c96cf902be/petekuzu.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/47h6emkh0hi67d08bbf2i87c57/fuwuxalugorotojolesogi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f5ea08d18722afbf8367113af5dfbece/jijorak.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/96026300356.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/kusodomaxefow.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93fd4b957---7703333595.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/65d9ce1ee79630dee6a07f7a2e3a3310/futoxamuveworofakoju.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ba41bb222397e3b58583c8502afa67fc/81024645367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=que+es+psicologia+general+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 1936 bytes
SHA-256: 7be29d029cc9edd1ca65214835b7df57e29855e267137a0e9c654e8bd32ff9f8
font_02_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 10856 bytes
SHA-256: 5fcbf258ed6f5d5b301a2f5b9945efeb4bc1c493f0955b0ffa7aafddfad87a2d
font_03_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 17480 bytes
SHA-256: 44f9f55c7ad1f61e68581075d02f71d624ed9dbd8a774409d978e358e2c895e2

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