Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf25c61c899d1a2…

MALICIOUS

PDF

64.0 KB Created: 2021-09-19 20:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e30cb7791b4f76f70698876cb8f1b08c SHA-1: a2df35fe3e364df591acb9849a60d49e01a0313e SHA-256: 9cf25c61c899d1a24b913f00a4b66af8c8f35d90d8ea1d9d50f089a1af1f0310
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious. The primary function appears to be directing traffic to potentially malicious or SEO-manipulated content, rather than executing a direct payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

Heuristics 4

  • 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
  • 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://laborke.ru/uplcv?utm_term=oktra+smart+led+32+inch+price+in+pakistan PDF link annotation
    • http://tythb.cn/uploadfile/files/dekavumuniwalokozolejimul.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/midaxunopepugobixuxasowom.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142514a26825---80941956723.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/54777201054.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905132358438120.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/fewutetopenalogoviji.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/42921387600.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/34188437959.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/75312308067.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109062136509810.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/lazexisawuwotimelet.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/99717010714.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/samobabavedomufexaparubi.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/wujejefoba.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/xomijulel.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/93369436676.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/62641083683.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/80731342860.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32c75f060---76208047738.pdfIn PDF document text
    • https://unaizahic.com/Files/files/kogoni.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/kidufutedavifobefuremuk.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/94036718065.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/73064401824.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614251a8eac13---12827724036.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/larimokadasaboxuwedisamo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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