Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02c22cd3c7bdaf7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 08:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2659c00352a63d35858bf1ff0a7c1b3c SHA-1: 8b0a8d760d508f716c21c325ccbd601cf953b7c0 SHA-256: e02c22cd3c7bdaf7cfdb4057d6513e6f24b868c3fb30a8365e122a6b2a6029a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or redirecting users to malicious sites. The presence of a link farm on compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://studiosantese.eu/userfiles/files/pozonupisoru.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cad22caa5d---lizofivukivumo.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/43710412731.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/32998040352.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/xupow.pdfIn PDF document text
    • http://kbchina.de/upload/meramuzom.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/72833050581.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/xadawug.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/ratisitaromiz.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/dafegugu.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/10591449732.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf6389a61---47267095344.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/jiwipovilipajasobetakume.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/80521726720.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/34627984421.pdfIn PDF document text
    • http://exima.kr/userData/board/file/rajugisizetexuvokojoxe.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/nifovusotanuduj.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/bebavo.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/14740831827.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/ruborigemebegedafowozij.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/83163448382.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0a4fe6b5f8f4a424705bb1d886b098cc/92423007390.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/kejalabobilesegigu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/pabibininokelosiledipeva.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/5892762801.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fidafigagefogijodipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+sound+volume+controlPDF 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 10516 bytes
SHA-256: 5f14ba36ad6099883590c5318f63b46d5c3b6e5a842ada027791aa01b828d056
font_02_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 18036 bytes
SHA-256: 23a2008b2ba46ce5f5f6d82d72dc6fa4f5784ca513ad6d2e9572d71fe4c2ad69

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