Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a4987f6c98a8b3…

MALICIOUS

PDF

79.3 KB Created: 2021-06-27 23:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0fb5b65d735962726f829fb6f487325c SHA-1: 79d3b92a926bae171f809fd482c5264d287164a0 SHA-256: c1a4987f6c98a8b33e3c87c212c2b20052f4a395c4278a3cc39a6ea231136022
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by an ML classifier and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, pointing to compromised WordPress upload directories and disposable hosting. The primary purpose appears to be redirecting users to potentially malicious or SEO-manipulated content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087038ad5a83---kobizedokufatopukedu.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cbbc0b499d92e316692be5d313e3f6bb/vesifu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/314229417.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/935015f08244a3f18e1024187e940b01/40436796323.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2bf08ef92d91c6e4eea58f44a53fe418/dekerivomulinurava.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/fibepuwu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1b4e58b4---93598122465.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e0b8bcb0df34efa0d741511f09ba1d72/13211241221.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/2403739262.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/37195095142.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4420bea85a1e6ebbffc670cdeedcbf93/fikemifegesasudid.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cd0a2d12c18167359eee5367b0db035f/32699715455.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acca0c0ad5b---lodolizobijipe.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/98888778618.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/84927076656.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cede64466c7---76745302272.pdfIn PDF document text
    • http://midel.me/userfiles/file/nurudefokazagixazesixip.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/20153745638.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/t3aah0re5fpl0c66cluield1j7/69017094814.pdfIn PDF document text
    • http://hrudolf.com/userfiles/94979078961.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/68423221059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=examples+of+long+acting+bronchodilatorsPDF 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_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 16680 bytes
SHA-256: 37fb2a54333e22fab9a6ed47b3f0984db4734403a8ea0a948cc703f4abd81a84
font_01_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 11292 bytes
SHA-256: 6ac005aa53ca4f249bff10222e5d432fcced28ca3787502f95159728540e9189
font_02_sfnt_off00011816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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