Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd41f12cff1a64f…

MALICIOUS

PDF

72.0 KB Created: 2021-08-28 07:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1078a69c8bd7a11ebe9cb6365b89772 SHA-1: b0e06a8bd2c1784088a699c71e1d6be11cb047ee SHA-256: 4dd41f12cff1a64fb307182e62df2b1dae578c0db175fb0a96d1ad6188748b53
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 a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent. The file's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://accounting789.com/ThImg/file/28725305649.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9acbd1ea90ae02df052e9a004d4f5790/tadewiviselepigaperaw.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82d85265ce---52921533546.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kaxanoviropotibenakala.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/kunexoso.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/cd2a3f283d5d56be33c50ccb0ffadd8a/bunugutilake.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/faxarogiv.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/ximavajasuwapabujevelito.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/58496140494.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/47623384837.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/atgc46s2mknpskkpu0l5kckdda/tivobikaliboranuzuzupewe.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a568a598804---pipiju.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/39936786930.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/9f603523af4aca9a3620367f5c8cd55a/46016031300.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a49714a3fca---50341888333.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/45695847931.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/25457914273.pdfIn PDF document text
    • http://metallpress.info/files/wopaz.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/jirifadejudibijigular.pdfIn PDF document text
    • https://noddy.nu/images/file/18146017807.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/bunaguwevuteru.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bosokukiruk.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021081917130673499.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/38715537498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=convert+pdf+to+eps+high+qualityPDF 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_off0000b96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96F 11232 bytes
SHA-256: 3f95240918b38d2a6d9dee65ffdf0fe7422091d4dd8f11c3c594e0a19987f148
font_01_sfnt_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 15488 bytes
SHA-256: 6cccb2a9075efefbfabb669a8fb7c2b1a7812ccebef27b18a2be2d61f8a2ed1c