Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bb32452b01ee5f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 17:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa3fb3f4e1e5a54adcef13389407c7d1 SHA-1: f30cb24d4685c26b6eaf2725ba2237d98ba754c1 SHA-256: e6bb32452b01ee5fde77099a288512b993dc46576da2793230bbead2a496580d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://catamma.ru/uplcv?utm_term=cast+with+subtitles+android PDF link annotation
    • https://hondaotohaiphong.vn/upload/files/99604910848.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/lasusizefewivufudubiguve.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4fcdc98a50b528901906165f6a684066/lesiromidupixefav.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/63033187169.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/nokurogezuxixiwunewonumab.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jibirobetanurufujos.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1fcd6d7c6c2ec7e1401e9389e6eeb027/85060247920.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/49536884485.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/xezogo.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/sokumemedovilaf.pdfIn PDF document text
    • https://people11people.com/uploads/File/10735997756.pdfIn PDF document text
    • http://parilka.by/var/upload/file/notikexobojipe.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/85525167204.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dokaxikokajapesapuwa.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/vazifigeluvo.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/94727383860.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a767c27316dc4080c495449877ab2354/75324103004.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091518071929.pdfIn PDF document text
    • http://fullx.net/files/89329359495.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/23127306011.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/11896529424.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614787b3a6731---zetexovepefosomu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a236d3565---faviban.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/zegudopewegawaf.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_off0000c60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60F 10700 bytes
SHA-256: 8560d1b51f8be1eda69142d20039f6eac6006c90afbdf76d21e3433e7ed2daa3
font_01_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 17424 bytes
SHA-256: 3da47d1c2b4b57dbfd4bcfa097272c8dd1c87300d1bb314285b85d2e0da3ba04
font_02_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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