Malicious PDF — malware analysis report

Static analysis result for SHA-256 2574e55c1f4062a8…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 11:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4bdd2e1e390821e54289630234938f0c SHA-1: 7bfbc6bcbefddca87396ef68daf51a5f84e59453 SHA-256: 2574e55c1f4062a8cc02964588e8b045b5221d8db709e3cdda8ed1f135c53eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' directly support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://rawoctane.com/uploads/file/foxiwozukuzanaxobuvobot.pdf In PDF document text
    • https://balajitutorial.com/admin/userfiles/file/69470746672.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae4aa5856---80130345397.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/96762632833.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/72837558484.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/gifogevose.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210914040931_1415569248.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/6421197752.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/golazinusa.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4o0a6e344ojrtu37b7147ur6r/senuvidutelopak.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142491194951---tisili.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6015012c5---87725575370.pdfIn PDF document text
    • https://windsbs.biz/files/file/11849474943.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/86620492746.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/46515261501.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614288a85a558---92016335066.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/loroliz.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/jigunemivakibidowevat.pdfIn PDF document text
    • https://ewt.cz/res/file/vedosonuzuramevexewu.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/92934538649.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3f500648023b961be7ea8d88f84c98af/18588829662.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/lusogaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=clip+studio+paint+for+androidPDF 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_off0000af12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF12 15568 bytes
SHA-256: c8bc1101e3964ec29494a3efba885d38ddc34adf18faa23e1666237cd25ed650
font_01_sfnt_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 10488 bytes
SHA-256: 125ff01b918e145ff96c6f0687e621521021c4ff132379ee94b0ed6eee831c6d
font_02_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1