Malicious PDF — malware analysis report

Static analysis result for SHA-256 b370e2d73acdebe5…

MALICIOUS

PDF

54.6 KB Created: 2021-06-24 01:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f89b5354fe25be8de88d603864e26061 SHA-1: 99d1ef78a94979ccd7bda63608ad9509272aadb2 SHA-256: b370e2d73acdebe512a9433a818a2a7d304211028a98a5c24a3ba50a9d651a9d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9723

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 https://oniceh.ru/uplcv?utm_term=jurassic+world+fallen+kingdom+stream PDF link annotation
    • https://kitapkapla.com/upload/ckfinder/files/vijutitusumurebozufe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e97890eea73dbefb19ee5bfd46e3ced5/6825312073.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/6ms3d4ktul0pes5t8rduljooj2/jifuzutagir.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/mrcn1v8vm1q6kdh1b6snn7bras/nagalotixukib.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/70334348287.pdfIn PDF document text
    • https://scriptdd.com/_file/file/45711147922.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/8283145012.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f224c4627c---15430630452.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/90782224997.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/folona.pdfIn PDF document text
    • http://candientushinko.com/images/file/mijaxamepoxevipoba.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80db494d9---luvamefejuvaxubos.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r3v5c5akqfgpk3rq2drl6t3ji7/rusumositifab.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lu52mu7c682kbfk3jdie8rr1q2/rabujokofetezeloxe.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881ad8725ef---zuguroxutuxazadorimana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEF 5484 bytes
SHA-256: b4e9455616252506a5d29f34dcaca8d1057f567bdcf4671478e2956f93faabc1

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