Malicious PDF — malware analysis report

Static analysis result for SHA-256 725fcb9601bc780b…

MALICIOUS

PDF

99.7 KB Created: 2021-07-06 03:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2106c657f1645a6b38d8d632cfd7fa7f SHA-1: ce4f068f744640d1961e998c2badf2e1b4782b85 SHA-256: 725fcb9601bc780bb54ca0719d35a008d6d538d263bfc97684047e0b682136f4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. No scripts were extracted, but the sheer volume and nature of the URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://pistant.ru/uplcv?utm_term=below+her+mouth+full+film PDF link annotation
    • http://blueyee.com/upload/file/141137104042.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/fafebenuzuvap.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/89750400794.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/fb6b882552d4ba960f3fef0d8b0cb864/66879704661.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/zofukivixumuruda.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/23828398146.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b45d4dae3---6059260971.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/9657636014.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ihn1cgje7abt5guc3b578i93hv/73470678037.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a72f245e51e---fugalexo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca04944bbc1---lipobolidusajebame.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cf5bf35554787bee93f838797c671c3f/ripamikagenekopemun.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3620907a43---28885872172.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/zugilunatukugumazegomazar.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/12d0k3umirl9vokrph1nhhu92c/nuxerusobok.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28745fe46a6d8197a08083033fb0b9bb/kaminipanage.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/37609582968.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/2f253s1lguvcgpicbrppk6ksfc/82916786719.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/niwopuw.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c541958944c3d20ed691839883ad5104/logomazuliw.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1p624th87ojrklvs7b8ihu7hcg/57928772917.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gvl1jadh3hikuq1rvr0825ql32/68731036609.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a93824224---24974399075.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210614_C4DB2FC9081E0551.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 2016 bytes
SHA-256: 5c6a0ec32a405437d6addec93d749c8d520cc1fd6528ea8f90a1998d56a0aa57
font_02_sfnt_off00013aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AED 17812 bytes
SHA-256: 669326e88631297dd65b4599fdff14866167068823727f19b385c82f6324cb4a
font_03_sfnt_off000169d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D3 10284 bytes
SHA-256: 7f29b97a7af31487e769b7ec047ece4cc555030c8339b56e04005b65a8767f4f

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