Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bb4564e08dea48…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 18:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5f315d39bbec6328c770fc02899cc839 SHA-1: 447085090bff22f159d9b38eb8c9df8bb39c2531 SHA-256: c1bb4564e08dea4801ae5ded9fb373c81b4b46e8ed49b33a826bd0ee8b870b74
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are indicative of a spearphishing attachment, aiming to lead victims 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://laser-piskovani.cz/democms/userfiles/file/28374257609.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7400a019---84840327017.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16118e35331904---lorikanogilak.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/kazegat.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/pizazenifowivisoni.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16097a104b25c6---71589657959.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/femogotosixosinezo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ikpntv1mjrcriq9n7sfol6g0lt/fefidubiloriba.pdfIn PDF document text
    • http://juentai.com/userfiles/files/bukenolalupijidawisipono.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/84582535976.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/48912315035.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h3rr32h1j8la7r9lalesis5hug/nuwatuzumazimirim.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/pejusekez.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937d274792e---faropuwokikitilomoxabo.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pulikuwaxofefotumogirolid.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82bbef032---39636866390.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4b508046bbd189d5f629c8ad49a8400a/waxifereb.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-19/20210519234301453230.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/jozimonulusizeligevelen.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fdd3243b0f5880e11f0375b3b82af252/83959294516.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/22886011620.pdfIn PDF document text
    • https://jagominum.com/contents//files/xupakobeda.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/gowubirarixunusakopaga.pdfIn PDF document text
    • http://unibox.lv/files/text/mutajefi.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/wigovusixajej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=estimating+square+roots+number+line+worksheetPDF 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_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 11104 bytes
SHA-256: 2657574957ce6c5aec9415dc363308f46cb8e1e063cbd0c3e2a271f4e000ac0e
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 17728 bytes
SHA-256: 7464448739be16e50ee353f52daf71dc744190ad2a87d93b6bd39deb890b5b36