Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea08d20d1a90144e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 12:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09b66a3bc395cba42b732961f463021e SHA-1: c887de94042619c644a7339ee0584e2d997986be SHA-256: ea08d20d1a90144e856e6f5fbcd473a9451da1b93cc50ba3804acf0b25fe8289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://garnet-medical.com/userfiles/files/nizevezuxizajikaxor.pdf In PDF document text
    • http://riccaassociati.eu/userfiles/files/didalegoxej.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/34750855992.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/90265609257.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/93656666649.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/19921895672.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/i58mi1korih0oo3rbgcleds070/11181975739.pdfIn PDF document text
    • https://negaratoto.com/contents/files/garusagubugebenokimuni.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/deziwub.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/xateba.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/63114649192.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/lenojibikenunigo.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gs816fook63hlam97qb2767jae/paxevevifawiko.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/fuxanijusurigofubenixe.pdfIn PDF document text
    • http://newcityhk.com/userfiles/427466721.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144beeb3bb68---17233503244.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/revavajomanemewaviniwewe.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaa851be0c---likitosaxemuw.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/55772760440.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210917/file/gijaxagogosugakugub.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/nikebabogakor.pdfIn PDF document text
    • https://laser123.com/geektic/files/50562908823.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/kogolisedunijotelaj.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/jobenutupamisetav.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/voxogowu.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/rugizomanisuvuzavuvode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+download+wwe+2k21PDF 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_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 10224 bytes
SHA-256: 5427a1fdb47de01b5ee29fde285b1df00e616d50ef3fb96352c717a8f93fd985
font_01_sfnt_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 18212 bytes
SHA-256: af9ebb68bfd772e81b1e2f2feff959ce743bf21a5a34f2a688fce95d660174aa
font_02_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1