Malicious PDF — malware analysis report

Static analysis result for SHA-256 c467fb79f74520d7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 22:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c65ba654c5dc6190b6be2dfc24fc495 SHA-1: 827fffb539b38bfa56f1270def01d1ccbc86d5af SHA-256: c467fb79f74520d76bfe19d7d2e7a1fabcdbfd7844df640d793433a4fe8730ac
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple distinct hosts, including one identified as a compromised WordPress upload storage, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alpinismbihor.ro/app/webroot/files/userfiles/files/78605821953.pdf In PDF document text
    • https://muratay.nl/userfiles/file/ponokosuj.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/7620728620.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/rafululezorafetu.pdfIn PDF document text
    • https://purefeeling8.com/data/file/puninimokudevide.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/tobigebopurav.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/92667513215.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d068b1900---19391701763.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/bitovutabenokitorakilelu.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/juvedoju.pdfIn PDF document text
    • http://schokozentrale.de/idata/rinugug.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48d33d04b6---34159402523.pdfIn PDF document text
    • http://24cvety.ru/upload/files/betiwirumulijanowuvusiwur.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/mizimefogalavidutoga.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/21497106297.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56205d0be---69564640756.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/gisevupemunemaxojebiw.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/movofupin.pdfIn PDF document text
    • http://uco-kampen.com/media/files/98773993861.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/44aae4caef4d02977b5e8553f185d10a/61395118231.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/sifan.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a189a589d725ea25af9d86636c535804/rutul.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/4455491050.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ad6ce203f3c7721a1a2804721f1f6986/96502694925.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/37760366765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tension+superficielle+definition+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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 18880 bytes
SHA-256: 1eb78e4dedc77296a172c0c516e121e300e1ccf447b558572a236a42aef8a7dc
font_02_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 10516 bytes
SHA-256: 22a0233e5a9d37b2ab73b0759c615e4e39431202d2522dcaf31f6464aabcaf5f

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