Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efd235a1c3b5303…

MALICIOUS

PDF

100.8 KB Created: 2021-09-13 08:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5cdedd946216d55d0cfe252ce1ab38f SHA-1: 77866974e70f01e1297ca94ff15960e6c54fe663 SHA-256: 8efd235a1c3b53038dd8ceb3efed329917773d162fdfdd6eb79c472a37921e49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.jindatunnel.com/up_files/file/fivuzurototizas.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e90a19c1b73b6101a3e81e35fa04f9f3/35665127855.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/9006445030.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/43616805429.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/64844610307.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161385051aa84d---sejipolok.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/bepolelipavol.pdfIn PDF document text
    • http://373113.linker.tw/files/63716756885.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/rivibifur.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210903_051310.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jalozosan.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ccabdece5---bigogorabozazasuvizazif.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/26001497472.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/bebikapox.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/da30b5813107dff98c072f5fb818f59f/83583461425.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/79572409450.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/tizuripipitup.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/wikawigeveduvikawire.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/gijemukuf.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfbfb4db22---gijatewupixulelosebuwos.pdfIn PDF document text
    • http://saint-party.com/media/file/68408225348.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda43f390d---327113403.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/pebipaferajawajoxagono.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/vetebaxasoguvewokoradol.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/53226796237.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/zurarepedabomir.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/27644924823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=my+hero+academia+movie+4+release+datePDF 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_off000115ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 10784 bytes
SHA-256: 8b8279cc438c18da660bcbcf8920c091b46bfea769c90cdccd56af575fb7d5fb
font_02_sfnt_off000146f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F2 23480 bytes
SHA-256: 1859a68d0cc0c3a78ae7f89b118818828ecbd97866018371e6a816586fca32e1

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