Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65730ab6ffbaff3…

MALICIOUS

PDF

62.7 KB Created: 2021-05-28 01:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6230d1eee262e47d55caba564379ece SHA-1: 1e213752da65169cc57532e8d399d05ae93913e9 SHA-256: a65730ab6ffbaff3f9c7aac5491db40fb736736753509e9458e65780bbc81a5e
94 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories. These links likely serve as a distribution point for further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting further supports a malicious intent, likely for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 4

  • 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
  • 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://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afe7fdcbd8c---lofopoxinuvogixitowomone.pdf
    • https://sasalidayanisma.org/uploads/file/tafedu.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/xideperuvasejodomibu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085259b9482c---50093034498.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4b7ae209---79613063468.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/70518123985d9f2837f5fb599166328d/1509202771.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38d0441ab---63302842070.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/10bi0of5i57mt1hmto6d6qrlr6/sewexores.pdf
    • https://akita-inu.lv/www/files/files/bopomenofidisesupewuk.pdf
    • http://yesilderecine.com/admin/editor_resim/file/2416785827.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085029ce9315---54332224632.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099332c8a6ed---nezimedolu.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/h63ml5qmbf7gh9vh3c3ai0khp2/61451508868.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a29c5a20---gigunirowadukofijiro.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845686027c2---59611703942.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7cc474bfa---geditutomuterofiwab.pdf
    • https://mangmalungtea.com/userfiles/file/nesinesaboxezujimul.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec1b626705---53457192111.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a7d60c6028a3f8221b846fc895b20f6b/40841507237.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f17d049eff---kemuxavuvabobatenepo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+a+face+mask+steps
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b7.bin
305a37bf3a18bad5e23c9845d26296ba54bcc8ac4bd9ba4132641c3bb17d2f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 5152 bytes

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