Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbc0959f639cf9a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 14:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eef6830425bd2840a579a2b04c891033 SHA-1: 5205734f4bef60a74b69d8b3683244bf8eae7933 SHA-256: dcbc0959f639cf9a42dc3661441efdb35bf9bb292a3be8bfac847ae108933a71
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection.

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 http://gidaero.com/upload/fckeditor/file/24004071370.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fcbcfd5460161701f355d5f9649749c7/rutopefoju.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/baxopikeluz.pdfIn PDF document text
    • http://chayka-svg.ru/files/majanumoz.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/bifojosox.pdfIn PDF document text
    • http://teraval.cz/res/file/23791737563.pdfIn PDF document text
    • https://maisonforville.be/documents/file/73793957465.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/49502526242.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/47307040064.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/79993561412.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8975a53e---62983144773.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/54654666825.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109071736079111.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/2032160859.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210903_324F5C866050FFD8.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/robodilafemiwaxira.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/jakujef.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/56363164274.pdfIn PDF document text
    • https://unaizahic.com/Files/files/84153104468.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/labelufebudog.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/kawekavi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b66a02d5ecd440f1ed5b6a07589fc44/kutoxolenenezexavi.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142787bbf4c0---125052045.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/dadbc533fa6792ffdea19b5b10c1f53b/12239598781.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/nluj2js90pab5gcbeimgtpcapi/bavizaxumepifijugabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=og+mandino+najveci+trgovac+na+svetu+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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 11240 bytes
SHA-256: fc2f10bcb0e33712e90ae9f05407221db2b6eff80afbb022b5244030651c6015
font_01_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 17684 bytes
SHA-256: 3da0653c468f59b5c22bc9060e1a5258718b8d31b6d49e8f1384533892f9ddac