Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee86d00cb9fbbe9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 12:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34ca56dcae5b320152aaebdfe6b7fcf6 SHA-1: 7e40ed6fcf71a0280edd103eb0e927b1d485c8c3 SHA-256: 2ee86d00cb9fbbe992e13f53ca8b6ace92ac152243eab9767a3954dbdd0e61b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160725ad1e2c08---80593499792.pdf In PDF document text
    • http://ahsaipu.com/v15/Upload/file/202156349507920.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/66534666185.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/dinovawuxajuwip.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/bumafaxejifuvu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8fpdaad3bfi607s4v817o8ghf3/xopapizakividij.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/mepez.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/56627704353.pdfIn PDF document text
    • http://rjt1.org/upload/files/78347330440.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/191073130be34e50ac8a23d63ad439fc/87371474928.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6566c88f49933f3ff20aca47e1597c27/widezogixapi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lowotoxexugisorugixiv.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/97033065794.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/88461531879.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/bizoda.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/luwupubepunetubepogutujuv.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6vfisr5ssbh4g73qvjq0e1ikh0/ligunusis.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1bc313be---95902645374.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/60919507701.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/93057710882.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/vasimejap.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///18671901846.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/93337898791.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kavamuralubejara.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc009b0871---95701017496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=allenare+il+core+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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 18076 bytes
SHA-256: 02c225cfc7013e241313c838bddfa2b3e9733ffa105ebf6f07bb3b5333a52e80
font_01_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 10328 bytes
SHA-256: c5f3bb4fbc4579d08a5ccfda654faa6fdb1bd2a7fdae2955ed101cd9ece51a2d
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1