Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a4390416f0b29…

MALICIOUS

PDF

95.3 KB Created: 2021-08-22 04:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 134ab5140cca6f256bca3f7a2b2fb410 SHA-1: 03e9266e949d82b3425d77a285b560caa514255e SHA-256: 3d5a4390416f0b292c8756caa8af9cd3fa341b5ca8ce20a185f8ed9d5a1a2cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bd7e0b4057b5b5f60fbca6c6d9ab6541/48948751178.pdf In PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/48491259992.pdfIn PDF document text
    • http://huefpdf.org/upload/file/jekutugelerunov.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/6am3uetc0f311j14ndncptlud5/zefuvizumosukutabavi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a56c0c694---gasonaj.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2f138a612fe0fffe9ce8f944b77f4402/77019834844.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/tubififiradoru.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6e02638acef6af2f76370dd24e40ad13/didepoxagowatesekobosivex.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da35574601b---razatusetawuv.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33e4d2d41---81448794046.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/megiwufejakufizusufujitox.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gbkdfkkvd6qdbgjkkqabqaqgg9/kekikuzedazegas.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/99795923960.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ni16l7po49apm9a8140savqpvc/tidutamasavalagexa.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/4796770063.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/vemuvemorazug.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/80661841652.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/c6g13nthsg3ov1floalgt75o87/24609620528.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/34658583120.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607214fb4c84e---24468382215.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/84535925513.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79575f7b6---wodukoniwudurodatefizeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+microsoft+office+2019+gratis+en+espa%C3%B1olPDF 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_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 11492 bytes
SHA-256: 86dd4c3ff137f2d56e73ffda7cc220a5588d7957c6e67e91365fc51ff05059b5
font_02_sfnt_off00013e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E32 17832 bytes
SHA-256: 4659306f6b8e8274e121de43d0e052f3e65641f8ddda669347eab1c91430bc97

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