Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44081514f448a16…

MALICIOUS

PDF

78.8 KB Created: 2021-06-25 13:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 936b77b70c54dfd6b1e3453c75c11a75 SHA-1: 8aaeb15029db3bd1d0fa43493e60e3a7fec3966c SHA-256: a44081514f448a16fb01f95936316a0a3f310934d19d2dfdda1e3856c60facdb
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters for redirection, common in SEO poisoning or phishing campaigns. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest an intent to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

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://irlanc.ru/uplcv?utm_term=sop+business+meaning PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aded826e5---2290071085.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/vuwoz.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/46dcc5da47bfbbbf167566c8824aa502/89034702327.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0brsbhel8l10i4nrjdt0bacjkm/zupiwenilawujo.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c35a8e93a8506f32d64e4794b95d447a/kenowefunazuxisorap.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608788e422cdb---warog.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085604c05380---mupirujivozusarapefep.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nf5rifmuir38l8n489gi7h6frk/78775293073.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cd8b431ebef79ef30c1b6a86492ea1bc/92373781292.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f809ee2a67eb0cb9a2a7ee3697a1451f/jerobuvazigu.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfc57ce788722a9baa3667e1c62ba79f/tutajogivategajiluxakoku.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/bubowubomugepit.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 16768 bytes
SHA-256: 5ddc4c73d89eb29f9ee9a614e2ec9f23103d8d86fc9b5ebb8d3f2e9191c817e7
font_01_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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