Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a924cd5b3416ad2…

MALICIOUS

PDF

87.0 KB Created: 2021-07-24 07:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d4c09a553a2c56596b9659ce3b94ca6 SHA-1: ff9417954431864e72f8ef7c244ff1ba7dbc9f82 SHA-256: 0a924cd5b3416ad23f831b9b16696c356c45639052758d84ad3836c68a0d8182
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be hosted on compromised CMS upload storage or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or SEO spam, rather than delivering an active exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://meandnetworking.com/ckfinder/userfiles/files/tupesorepifejanukuxo.pdf In PDF document text
    • http://sns.hu/_user/file/mubigidozuwiboregirogesob.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/musibid.pdfIn PDF document text
    • http://short-story.ru/upload/file/sujatufisamolum.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/gawomig.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/60403441159.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/xigirujelufemawumokuf.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2bd14bf25---45193833526.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c1ac637d---jewuverakanodabujupumet.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8c3a4d3bca155f03dcfe9d0a024e0dd4/gadakiwekowenodivobo.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/31814132498.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/656ff96b63953545f7a397313613f17f/30509099360.pdfIn PDF document text
    • https://yellowstonewildlife.com/93778395134.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5nc61989198njgsjiovku11qt0/fagekalawa.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3dedb0af---70649543939.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/8d6e1bbbe775c901afd11ff7dc23ca8e/39701233791.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c7eba50ca385029ed91b22b77e608284/22329215812.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f10533186---zefadikizo.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/bujanagufusadiwolotime.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/71298333974.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa684b71f06---59330779777.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca676e5ebc---tuvazoriwasevat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=adjective+activities+year+5PDF 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_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16540 bytes
SHA-256: db5f91f061531bd773b6bc843b3d5697cf1d93401baf2f239372cf286b243d6d
font_01_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 10516 bytes
SHA-256: e9977fdb7ed733159c5b85d2f9320824d58152e241336db439bf6e3bdd0b212f
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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