Malicious PDF — malware analysis report

Static analysis result for SHA-256 286192f01df59495…

MALICIOUS

PDF

82.3 KB Created: 2021-06-25 15:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35cda75213dbf4175b9846680d652ac3 SHA-1: aab8fee091c68bb75a652b251ec6adafe44ab878 SHA-256: 286192f01df59495fbbe0f5914c17c77317dad018ab2b450e80a4eeffdd8143b
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. The ML classifier strongly indicated maliciousness, and heuristics identified it as a link farm on disposable hosting. The primary purpose appears to be distributing further malicious content or manipulating search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://absolutelyneon.com/userfiles/file/40800024653.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160709cf38d552---50250129561.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/pademipuwabefi.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/kjsfhvbk7t5a8bek14ummbgg3b/23304297402.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fp1rlab3mohgbhm771qk0npo6k/pigoruwabufifebitipobiv.pdf
    • http://hzjksj.com/images/upload/File/jixat.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f8200d7af7df84cf9d9de49178946e21/derukuxawilaloxek.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a158b1877b1---50793874444.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16083b979df6c9---josasenotuwijerule.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094696d1dc0c---wewab.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2e8bd6fd0c5a86d1f1003d1186d565c1/vamavasakaw.pdf
    • https://digireg.se/upload/tupowumuputifim.pdf
    • http://onellenorzes.com/uploads/files/75009251866.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607250363da60---xejifevidofimakud.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/22efe1df8e31ddc2e2d55ee2945db432/24812723812.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c8960a59f2837a5e6f477b991e19e52d/vunexupemefolikulub.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1qnpsk2inflmo9p7ej6n0f1gv7/golenotibebupuwulujulir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=foley+catheter+color+size+chart
    • 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_off0000e037.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 16792 bytes
font_01_sfnt_off0000f849.bin
1b3b35737436f17cf865758814d7b79521a7cfced83a7fafbc5e28be29d33222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 17128 bytes
font_02_sfnt_off000124bc.bin
d27d36414564e89bde8a7de2d3d485e2a20c03e557290456ce3271428b211499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 10372 bytes

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