Malicious PDF — malware analysis report

Static analysis result for SHA-256 7839b86da1f3ef9c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 13:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d416290ba6c5ae2f7655fce9ebf0efe7 SHA-1: 7b3ae568414e4d37f1893405d1fb3614c76fb695 SHA-256: 7839b86da1f3ef9c9dc8d63ddee055e15e8e2768f8eafc4841607af45491631c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to lead users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=facebook+login+sign+in+now
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/sefarimimaxaxuteb.pdf
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/sixodenobo.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/24563395353.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/larexugevimikirezupesus.pdf
    • https://buyafranchise.org/files/files/14985802910.pdf
    • http://runo34.ru/attachments/file/20779152322.pdf
    • http://bmcnx.com/userfiles/file/17532965970.pdf
    • http://ryanoomen.nl/uploadimages/files/19143339873.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161341803f0453---54428948969.pdf
    • http://siblom.ru/files/upload/file/63044821718.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/77301508982.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/02e09daadf72709de567117edd2a1128/95294627519.pdf
    • https://denimder.org/resimler/files/7298989928.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/63242055014.pdf
    • http://homelife-superstars.com/image/files/kanetoxal.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/33889599774.pdf
    • https://lotteppta.com/beta/assets/file/gofogikugavujolupu.pdf
    • https://gruntbudowa.pl/files/file/59157830052.pdf
    • http://logistra.fr/ressource/site-image/files/lopuvatopefoma.pdf
    • http://freeski.hu/freeski/file/bikulakimokitulif.pdf
    • http://paglialonga.it/userfiles/files/25518516738.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/30543674674.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f63277687---8913080565.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divivanidebip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be43.bin
3c028ffa20f9e4dc1d1effdd92084536c352e2d3ec8518b8f8a768aa676027c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE43 10500 bytes
font_01_sfnt_off0000d64a.bin
6ad9c67afbe5276938f1e0adbee3fbff14fc57f82593e6b9d2b89d6fbb34be30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 15920 bytes
font_02_sfnt_off0000ff67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16792 bytes

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