Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d03b6df5068749a…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 12:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7d79de08a576e6b006c4cae5e7fa65f6 SHA-1: 2fcc54e3c0c2bf3ed299cfc6dbc480b752762da9 SHA-256: 4d03b6df5068749a9a186258c060827b06ee04d04fe44297930d31e6fb08155a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting domains. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of a link farm designed to direct users to potentially malicious content. No scripts were extracted, but the structure and URL patterns suggest a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/259c7259f950efa335d9bc1a94284597/sevoni.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/99e9abefabe867a83d860f1a958d0625/48915499551.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/tumesugelemomi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/xofarujelutep.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/24813099531.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/57570194620.pdfIn PDF document text
    • https://blokhol.com/upload/files/veletuwigi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/fc0cdqd8nj6amvdn4hgjclqj77/gomerepifubadew.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612cfe3257d72---79420015650.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d61a2c3ac2d---futikov.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e58202f40b---giriwifuwuk.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d235e43516a---79542442940.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2d2254d693c2ea72532293d69b6f8af3/80269464343.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/frh06ubicmu0ck8qiptss9r8uu/lobixuremovokotoruperopa.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/30919816294.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16123492f98e84---21749453881.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/tewufatuwofazilakonozaru.pdfIn PDF document text
    • http://htwy.com/upload/file/32052091188.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0006de380be2a946932c7c5733a6272d/69676595069.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b4329a31b52---98407378710.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/e10u14dlbl4p5c3ik9i03qcum3/nakejakevikopox.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/3353ddf3619e8db7248e211562e315b5/30718736981.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/47867463702.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/nifegaxoropirafabefituf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=white+hall+state+historic+sitePDF 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_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 18452 bytes
SHA-256: 3a934194b784c721163be8c58637eea0b559688214327957d2d9c0c1296e8bb8
font_01_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14799 10216 bytes
SHA-256: d56636f5c859cb0492503e1e9e17c0cb151d2e7b69683bdcbd8af07f24f5e6fb

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