Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de2796fe0c38c85…

MALICIOUS

PDF

89.2 KB Created: 2021-07-14 06:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 85da48a1d423dd7b24d686950b0c4ef3 SHA-1: 3d178e955315e93ce89528f38cea8c13f8422585 SHA-256: 5de2796fe0c38c85491bcfde47a0555de574f3c34525434985eb5a9bc7832bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/60a25aee6600d9a496b4c143422635c0/39168759870.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745e9e87106---paguzedenowoxa.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0305bdef1---fareloludasunumi.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/wepujuwulunavuwozi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a60c705f37498a1313fa9edcd16235b2/lofixomemidogowetiboxova.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/muvatasisegevig.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e220a2eae---50343377897.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/wewavabosegutiwoxedi.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/nebife.pdfIn PDF document text
    • https://gangnampools.com/contents//files/logot.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/n2gi4sj232ppi51hpiu8rj7ln4/48982616919.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/10799d1vl610d21mreceud6nl2/memekexox.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/21603894918.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o6io97qtjcopt3t8q7u9uhjsp1/pepowepobum.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/163b4ad52bfef2369f075807c5df1216/xopegovifimesa.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/35d9b884a4b91cb155ed2fc41d72db2a/72371726104.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c599d2f3a82---84590234925.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c367162ceae6dfe2a24364aa8bb94407/50447034382.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c47414ef1cd---660757537.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608567acc6d0f---goxokonawegekuwatufe.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b546bd56488---parapetuzubekotuvemav.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726024e1d06---zezowotuxunidila.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b1770de6---38197853970.pdfIn PDF document text
    • https://dm288.rs/slicice/file/9883387547.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1aacdd69955af5d54f20774ca2752bd9/vivifajuwoxinetixomigux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+saltatory+propagationPDF 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_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 18460 bytes
SHA-256: b7c7d1a0f218770aa3090ff388cd4c65f2637a2251624c942a69e442f370f816
font_01_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 10504 bytes
SHA-256: 2251c0e85bbdb02b7462665b24c1c79ae76c10dfbf9db84914250d105091fc2f
font_02_sfnt_off00013f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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