Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6360857d3984493…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 13:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2710a6632a743113c034e357b47e81f SHA-1: 0bc75931f29cf26ddf9cca0531df39dadbf0ef65 SHA-256: f6360857d3984493a315175547147a91478b57a06acd25de2644dd251c9ec923
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious intent, including brand impersonation for credential phishing, a visual download button lure, and a link farm pointing to potentially compromised WordPress upload storage. The embedded JavaScript stream and numerous external links suggest an attempt to redirect the user to malicious sites or download further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=open+proxy+tunnel+apk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://k-barrierfree.com/FileData/ckfinder/files/20210908_0F5A397EB4BA6E47.pdf In PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/makopafibaselux.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/vejovideresasoxi.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/40520125414.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/taridolagigituletuku.pdfIn PDF document text
    • http://dnepropress.net/files/file/96786452092.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wuredakedodivefemiv.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/tatefori.pdfIn PDF document text
    • http://home-plast.ru/foto/files/rimewajixurerefufifividi.pdfIn PDF document text
    • https://lapakunited.com/contents/files/faxokazabugoluwoka.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/883be1cbecc250180ace852f95b460f5/gegarur.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/3096228582.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/94881734680.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210909095148_92laxv.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/selonu.pdfIn PDF document text
    • http://soles2walk.com/data/file/99613737680.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/vinefukuson.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/ruvexudisavu.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/74016596406.pdfIn PDF document text
    • http://profstil.az/userfiles/file/9132247869.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/70388012090.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ac2c3246---fifezoxoderabuzoxuz.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b076ba0911---69517798882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=open+proxy+tunnel+apkPDF 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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 10416 bytes
SHA-256: d73d3fdea68cb2f3f16ddb9117058d329158b7bdfa13d23ec7d5db10f79a2e5f
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 16376 bytes
SHA-256: 7c76a5aac58b6b4c53933a42bcd5d906fbc77205c36189a8e55d713097d8246e
font_02_sfnt_off00012478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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