Malicious PDF — malware analysis report

Static analysis result for SHA-256 65af39ffed51d786…

MALICIOUS

PDF

207.1 KB Created: 2021-09-03 04:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b717498fe8125dca1b0cae4b46548891 SHA-1: c69785249467a00d04425eb907ed4111452059de SHA-256: 65af39ffed51d7869fcfd59b5edfad49c161945213c7999bae3c15ab5ff2eb74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

Heuristics 5

  • 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.
  • 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://gift-founder.com/archive/upload/files/zexetoniluwapotawoj.pdf In PDF document text
    • http://bainihu.com/upfiles/editor/files/zeralekivew.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/zixozepusu.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mafuk.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/53478747942.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f7c158e8---fakekujemiramegujigef.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hfam9jb1qilnn7j51d7b3f0co1/42848852581.pdfIn PDF document text
    • https://memoservicesrl.it/file/paburibap.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa950c49a---32445784286.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/79e87f311f785cbd700a71e8bc32c2fb/gonazip.pdfIn PDF document text
    • https://plasy.com/uploads/file/59698803077.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb76283395---lukefovafumovalifivugeke.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tovaboduwezuratet.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/68012737742.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/sivevuxizo.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/relolusifemuzesaxetuvagip.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f30f493800f578fac3d8e1b08474eb8b/23603233559.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/87177507477.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/i21dqq12g28jlgnsasbm3hp7s7/devakinewak.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/39484595309.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/22594e4d5a2b28ae27a924893bbb855c/kuxixotimebepa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609039f437e15---nefonikiv.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210710150247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cisco+mpls+and+vpn+architectures+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_off0002c74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C74E 11084 bytes
SHA-256: c7394c78ec2acf1152ade3dcf28015f322a46e523fb50ba0229f12749cc31a73
font_01_sfnt_off0002e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E0F7 19864 bytes
SHA-256: 8a5b761106c1b77a77a96ea5ef9b034d47de4aefd1d5a61849d8c08b81a32dd0
font_02_sfnt_off00031564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1