Malicious PDF — malware analysis report

Static analysis result for SHA-256 7497e509d75c25f8…

MALICIOUS

PDF

99.2 KB Created: 2021-09-04 21:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2389bb04ccb10a62fbe7aa27a44671d SHA-1: 03b891f5f5a951f63f4300230649ebf19308e533 SHA-256: 7497e509d75c25f8dda40d5abea354c586910c1874fccf20481b4eaa37058182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://tideandtigers.com/ckfinder/userfiles/files/97970589507.pdf In PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/29843599265.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e6a628f6d84d41be309075a81e4bf9cf/fekibebi.pdfIn PDF document text
    • http://pvvc.cz/files/53365069794.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b40a22b63b858019a35d5f45c32caf16/1117866043.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/pezigolilarudilato.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/70483578562.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/denirabad.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/127580177360ff58eb2d0a9.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ad7232794---35952397104.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/efb14aa3c35db6bb6c775ce5a15878a2/32293322436.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be598bb402e---doredunumoxaz.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/luvanisifode.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd38968067---59952616159.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/wopilaxijida.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fa2710a38---53016723602.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/biwepufova.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6b67e72e4---vabulazevusevuniraropil.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210721_214118.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5f5a74fc06dfa428d8ed9776f2620147/12396304302.pdfIn PDF document text
    • http://jfe.hk/userfiles/topidofubawufur.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/telunarominogudej.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d0e4951c6abf0baf600c0f821ceb61a2/vedebanadip.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/51305116093.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/xesegefuto.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/jujadowibupojev.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612341112d649---sokiwojakupigixagepan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=evasi%C3%B3n+de+impuestos+en+colombia+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_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 20292 bytes
SHA-256: 91e800a323b48070f61bc7aec9958d163225b4f1ce62dbb8629c8330510cb514
font_01_sfnt_off00014b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16329 11108 bytes
SHA-256: 87940ccc8dd5e2a2d8fc5a4bb2de0f719bdf8753aa0848d545bc7f1f7b537976

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