Malicious PDF — malware analysis report

Static analysis result for SHA-256 338ad7832bed37a3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 11:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0001f946086beee3eeb0d4e253a23a74 SHA-1: bfbb02649274edb90f7f869d60949c73467f1ca3 SHA-256: 338ad7832bed37a3f435d74b0794c96ec40e7df95c02d23bd935bdc2da440d0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious PDFs. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://lionkingbali.com/uploads/file/daxaxudawapavizawatufu.pdf In PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/79572693348.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161123bc81da82---fugakapilaxezudowowij.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/48863382989.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e64b8fa7b---86469833508.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/41257544442.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609077a9e9ccf---26922826957.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/22055153926.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e300e03d1d---10186072432.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/64249160567.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079772def2af---jidobijikegudositazexe.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/25242284453.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a321bd43e---vulobelisofora.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/37383190042.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210809_4EEC4165D5595E21.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/59d6f5d3619f40f68e8b9f4bb615c186/bumeputupupuzagapufole.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/21948512394.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/kujika.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lokerelezakobu.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/viled.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f88db1b9387---gikeki.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/6555573111.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c854ca74f71---17850629741.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/vaputaxuleri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ctet+old+question+paper+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_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 18220 bytes
SHA-256: c40198c0e3248efa6f7dee3dfef2f245685fb08e75c08436645aedf4ab724e03
font_01_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 10768 bytes
SHA-256: a118466c83e1a16c5d28443368573c630d4feb9e9ec40ece6b1172768d2311fb

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