Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5202ba618eedb4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 18:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1514b1a5d0204d7cdd48d31d1deb1abc SHA-1: 9ee56916977867d741b401c96667855076da819d SHA-256: be5202ba618eedb41386bf624d1257d9f21384a59f4c82df1c0ebc2f7dd18e4b
104 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The ML classifier strongly indicated maliciousness, and the overall structure points to a downloader or redirector for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=free+pc+games+apk PDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90adbbba4---weluzajuxunegefebelafe.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/benubidat.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fageg.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/fotominerugevatoruneguj.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/42287000581.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ef227e34---nobezo.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/febufageduseri.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a4ca53f29da48c0c7ad6e5b212742a50/9525469375.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/bugopiled.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/kegisesiwigu.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210903120304.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/23164697520.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/35721129636.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/396333120.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/geworejalo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/445g6fos5pe7k0le2rr53chcn6/66462071059.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/diwesurefogez.pdfIn PDF document text
    • http://www.andreapondika.cz/file/70941105190.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/pajamaredizuniwiv.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc6d2911e---kuwokinufutaxowuzisazag.pdfIn PDF document text
    • http://ttc-investco.com/img/files/2206957599.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jogewizogaxizexegedapu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ccs1h8upls4f4vjg3sj9b7ee30/45626549419.pdfIn PDF document text
    • 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_off0000b500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 16304 bytes
SHA-256: 72daa033a14566ad81307f6c0207d3711ea49939228192848482918ec757e921
font_02_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10328 bytes
SHA-256: 96e69524908166cb4b621996e5369899f6f27812f6689cb7bfd3f8c21c07a4a3

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