Malicious PDF — malware analysis report

Static analysis result for SHA-256 7849384cca024af2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 11:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0794c0e639d8ece35306f8d82e5fb98 SHA-1: 6a7c8bb36046a66c272379ae961af2be3fdef2ab SHA-256: 7849384cca024af2975ead9937fb459d83a89daf8db402bc6ac98a89575cc72d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. The embedded JavaScript and link farm suggest a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=all+file+opener+for+android PDF link annotation
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/73963863447.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/kabagivekazevosusewibuga.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/tujosedipavopurazufanufes.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c472394989---regarepefovogovok.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/v17t0nvvtj4i6tqb5gvj8s85m3/laluravanixezo.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/81711054515.pdfIn PDF document text
    • http://billsky.ee/files/file/kogolitafabowonagevedo.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/56249846319.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131122a498e9---jigoje.pdfIn PDF document text
    • https://kermanrooz.com/img/files/togemomomejagipebabuke.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/15563009819.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/zedilemudidasubupadudulu.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/85733153883.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/90159967206.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613986235ee14---bimipa.pdfIn PDF document text
    • http://kaies.net/upfiles/file/2089973875.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/xufoxowadolifiwuvu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136abb96590f---lafis.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kanilup.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/49348606124.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/bikagujuzet.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/81008621938.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/getadawuj.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/8075869756.pdfIn PDF document text
    • 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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 10204 bytes
SHA-256: f8fbc6be8754f2357db27c69bda81fd2b3c9d935a44ea03d02abad666439a6bc
font_02_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 17928 bytes
SHA-256: 36b7362841bdf1d847088503b2e6f542eccf949f64ac88563141a58e2dd92c09

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