Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdef930ad7981ea1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 21:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 89397961754bafa87b4969f325524547 SHA-1: 4a03ccd84251a1540e76ed8af9ac665f42944868 SHA-256: bdef930ad7981ea1e9037571273f549a0be80faf8656727ab5fc9e984a8af71d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the PDF's primary purpose is to redirect users to potentially malicious websites. The presence of multiple compromised CMS upload links further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://oniceh.ru/uplcv?utm_term=evolve+student+book+3a+pdf PDF link annotation
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/zegafefowefepab.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/92532869346.pdfIn PDF document text
    • https://eventaipei.com/upload/files/30662239815.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/ruxixegi.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/xezemilusaxufenadotem.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/12449397471.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/sitopudorideberegileb.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ee21a04c9584ee676216d1f7e590ac85/favibizet.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161350c77a0163---mivuwe.pdfIn PDF document text
    • http://xprchemical.com/upload/files/kekudesopatojetaxawub.pdfIn PDF document text
    • http://soc-in.com/data/media/files/45818459108.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/17867642605.pdfIn PDF document text
    • https://porfic.com/fotos/file/towevabosidumopafiso.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367196c7416---69997536586.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/71521610436.pdfIn PDF document text
    • http://apcmagon.com/userfiles/58089982551.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/putovalonadeviso.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109151237456862.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/64488395316.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/jiforubosezeva.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/totun.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210915_07F1C99408077974.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/28934333573.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0E 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 20844 bytes
SHA-256: 2dab35972244b7d63ee8ac59bd38f25124f358fbdb41549922bb81b9fb00b599
font_02_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10852 bytes
SHA-256: 62a6421ec8cc1b1036db803e7c910e719dd918265ae817ffe9384cb505905059
font_03_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 16348 bytes
SHA-256: 7480685c5a7bca1e069478500b3d9ce6cae7487baecb32448505a0401aaf85ce
font_04_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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