Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d6152f0264c939…

MALICIOUS

PDF

79.4 KB Created: 2021-10-13 15:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e5e87bc78a4223a2cc9a6ff314bcc45 SHA-1: e3fba4a60afc96ed53982440c42407320df93172 SHA-256: 87d6152f0264c939dbaafbda135f8c7ba17274ed62de641ffd4b80fba3a17d91
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external PDF files, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yevres.fr/ckfinder/userfiles/files/lanikewiloxaziwag.pdf In PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/wasetinetegizadinufuto.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xufujinizafizofexodi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161567f12604e7---tekos.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/doziwedotuzalitepugetir.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/44260370178.pdfIn PDF document text
    • http://praguetransfer.com/files/file/24732999038.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3e5a61c48---36539257614.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/wadefisepenerimunolujo.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/pegaxolipofan.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/46964394607.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/juteg.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/lefirusixalovudolo.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/mafijeravivifibeb.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/xidepefazezejaturoses.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161390d404b233---78569291678.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/92659839438.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/buposibi.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/nanaxapa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615b9428e3ed9---49653101790.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/78364706079.pdfIn PDF document text
    • http://houdcx.com/uploadfile/file///2021100911502443.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/bekuwe.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/15894070548.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b22aa1d983bd673f09dc931f515bca0d/manusokunozadilozobep.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=words+that+begin+and+end+with+the+same+letterPDF 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_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 18184 bytes
SHA-256: ed10d06b86bc34b70a591824f41d37c62e94c6eaf9d7b18e0c84d757dc10d488
font_01_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 10916 bytes
SHA-256: 5fe1d3a5fa4dff7a56fa4462d30b742be90436aaa5baf78f1a24b94b62188c29

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