Malicious PDF — malware analysis report

Static analysis result for SHA-256 2666cce8c9d527f5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 11:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac0f5aa336f04a97a3e2536b1adaf9ea SHA-1: 3232cf0de697ee68a29a52820d8d408a0863bf6c SHA-256: 2666cce8c9d527f5562698bc7dd6bdcdfeb13a0dfd625815c9d6c347a7e63b0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload storage or disposable hosting, 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 exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://bugaboo-buffalo.eu/UserFiles/File/wowem.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2skmo8jc0rl4scjinktqht6e96/loperalazadire.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138751d54f38---92276707.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/68815282562.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jc16m31fvfuv1lecjs2apb3sl6/nuvupunosu.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/29495509953.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/nematobeveb.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/7283608995.pdfIn PDF document text
    • http://landia-print.com/pdir/file/betugeg.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/wodibajowuzimisanoko.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130305b04f29---digazaxexot.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/69492654924.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/19682101713.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/90997511941.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/fagonadasidigotisaz.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/xositakuzavozunodiza.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/23971827981.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f057aeef79f4d4bf95e97e9c6f1a7332/bunomasopuvolav.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/16207313104.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/guxitazanibawomu.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/jagakidig.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/sifemabora.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/11261179650.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210901_B0E3E831D9F8C12C.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/3255960210.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/jajolabekeribulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=show+sport+tv+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC601 16416 bytes
SHA-256: 51715fcd80407cd9e8e695a24c5d376c6b09d9bd8df8911d8bf2cf1e6d8a3dc2
font_01_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 10536 bytes
SHA-256: b7523eb22469bc8afa6f69b90d9ea31e9b685b6eb07629e6441b3b41215e73c8
font_02_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 17068 bytes
SHA-256: 7b82885321ca04a14958aa2e66b0ecfe1f9a032d468379e03574f377135cbeb2
font_03_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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