Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a9749f9032f072…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 17:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9476a612fde5505baf20c37e3578997c SHA-1: 419aa8309dfd01f13e77f0f9694e5c141cf53169 SHA-256: 86a9749f9032f07299d6d816aa88c146635278e1d0f69c7c609308401e26fbc3
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic firing. The document also contains numerous external links, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of the PDF viewer or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kdwatch.net/upload/files/2021091215461062.pdf In PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/10574278534.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109040533145150.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fuwafibufetex.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/75a4a012ea8704e3e357bcef30874ac7/pexibusigevef.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/3151105920.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d280665f---jowizorezetisokorofo.pdfIn PDF document text
    • http://sbairs.com/datas/files/27787420716.pdfIn PDF document text
    • http://erex.hu/upload/file/ruvonufifetiwurovawidun.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/7851440298.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/59902093148.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/kodosikikosejob.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/felarumedunek.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090918121898.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/fefivuxaresuka.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecca5cc4dc---43607994312.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8bvfi6cmg3olcl89uolc3gvlf2/10090349992.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/gazulokosegewi.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/xutenonojekoladejegi.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/7164996423.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/17149962425.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/dikijabiduradejisas.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/xetixomawanibe.pdfIn PDF document text
    • http://zgic.ru/!upload/files/ziwofufipipowed.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/luvopemopoxowow.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/vipigin.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/zodilenixosuloxuwak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+the+last+wish+pdfPDF 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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 10584 bytes
SHA-256: f1114285d554190464b422781e6206603ba7a8dd2d394d6adef8b4bfb2072bd3
font_02_sfnt_off000116c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 17528 bytes
SHA-256: 68c8ebb3b5d3154e1786257df6fb667393d69a3c0b51cccb4536d3c3402b4841

Open this report in the interactive analyzer, or submit your own file for analysis.