Malicious PDF — malware analysis report

Static analysis result for SHA-256 09328f89fa1deac7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 21:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba8a0d802f41d9d15b7e881914b68375 SHA-1: 2a87e5c8d722dceb788629130751fad4651d6402 SHA-256: 09328f89fa1deac747547419e95b3f371c5e521dc9413a0a6b3667b9c69b2dfa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to various PDF files hosted on potentially compromised websites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions for accessing a password-protected archive, a common technique to evade security filters. While no scripts were directly extracted, the presence of numerous external links and the ML classifier's high confidence suggest malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.sunriseacademy.in/ckfinder/userfiles/files/toxobisu.pdf In PDF document text
    • http://jncs.kr/page_data/file/20210909110818.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/63291658484.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/fepolikapokasazizenuwiro.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/9971888741.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/30974195761.pdfIn PDF document text
    • http://ucokampen.com/media/files/58562793315.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/13842283192.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gusuvawanenegaseg.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/09a160dc581fd118073c0194d312df09/nonomibinokizarural.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/bubinamukudiwitujuxefoja.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/fugenilodapasovelopuviwol.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/92985159016.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2749683623.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/81416376001.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/30758039457.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rra37ecfsfaakg6gd174uh9qrf/16712140182.pdfIn PDF document text
    • http://patroha.hu/file/tujufumedikofu.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/zatudutokizobopasiv.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161372a21f20f0---40160463101.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/xuberolixiromedesim.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614085cf20c9c---28024680259.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/matepabanupuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+reboot+phone+without+passwordPDF 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_off0000b8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F3 16272 bytes
SHA-256: dda1f9993a95d237afcc051a6720585a09ac36789d6b788ec0eb7b45506f6084
font_01_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 10760 bytes
SHA-256: 1105906c34030002781917c4376212ed5993f99430f0b0a8e4c8cda0f071ab6c

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