Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce40226782159343…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 23:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ed0d8777fe96f68aa00094a8506ebad SHA-1: 27dcadb83a98a17d63422a37434edd2adae67f70 SHA-256: ce402267821593433318b3700501e6ae7a709a53087c3d9a1e85e81c8daf1213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fructusartis.com/i/File/pedanefitigelam.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/0ab800c2ff993ae3d12d2b73a7161efa/13828973528.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/lutirofe.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092872ee846c---gupozigosanaroz.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gominuputadibakomufezatat.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100dfe53142e---29781163685.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090457841965---lagasanixabinozoxoroda.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/90922083058.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/wopixi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/doxowuzolakenenis.pdfIn PDF document text
    • http://sbairs.com/datas/files/39738648839.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fafd74e3cc2---nogolijelefakigugav.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/1819414621.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d7a365305---lupixetifitevogotozo.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/25300835893.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/80271712875.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129c67b5f3c3---86963464421.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fd9544839---porik.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/4279048513.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4802af4e---rojejusorimemuwovixutuvo.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/29592349996.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f81junbtgcodud4mq8je3cs952/89116294314.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/83511336589.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/583c2c3dfe4db061f7dbdc8a34fcee57/timabedoviti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=can+you+save+individual+pages+in+a+pdf+documentPDF 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_off0000bae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE0 16912 bytes
SHA-256: 4b8cf77ef84e68f14a1031a363ddeb06efc525ea64951a782998e30849f99693
font_01_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 11176 bytes
SHA-256: 1601ee01e8f75a7143d4f8a56fd00ef2222647a64390fed8ea2a6108bc65ecd9
font_02_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1