Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2385ad3ac521c2f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 15:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e30252e613ccdf94a54b80b736f8752 SHA-1: 99a37c759c3be21a9c7c5c6bb5793ae7ce253063 SHA-256: d2385ad3ac521c2f40fb0cb76183bc823b4da6f1592ef2ab608ad3bc97858db9
104 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the overall structure and heuristic firings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/k0kc3ub60aigh5dasf9i1n9004/nufezabototesasivumofaz.pdf In PDF document text
    • https://kham.vn/userfiles/file/buzuwida.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/33939796360.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b877abb2e3f---neguteti.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/68235699988.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/386dbabf108be0eaae74091005b61964/kawafuwedomepevukufosej.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b448bd0b74---bopadidoduwewiwas.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e2a56722---96516719364.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/9a671e3fd7a323e921e32e03a5eabfd4/xujafa.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eff0d2afc25---44003911610.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/vanedodafovefugigotorikam.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/69192933228.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/83104466292.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/filodonukos.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/zirabivo.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/2fabeb2a235abdac5ba21c577052188a/muxamaresuw.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/tudelitota.pdfIn PDF document text
    • https://kristinanamaste.eu/files/kozawepasar.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/37848108113.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/72086317655.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e7eced237ca1dc36c3b3eca346b7fd18/bunuful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hp+prime+user+manual+pdfPDF 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_off0000b2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 15400 bytes
SHA-256: 2328bd1a352c21cfa4ae956945b58f3f685180132ff00219ce6d0f0b74375c5d
font_01_sfnt_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 10532 bytes
SHA-256: 90088e6803b77ebd686ad3903df4edf845b16dd26fdb9a5b2accde25d5fe1e26
font_02_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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