Malicious PDF — malware analysis report

Static analysis result for SHA-256 473debe63675d2b4…

MALICIOUS

PDF

136.9 KB Created: 2021-08-15 11:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0cfecdc7b52413e702596662ab7e3e80 SHA-1: a5dd139956230f6a583d97c2c222e7ff656b6062 SHA-256: 473debe63675d2b496f6205d7b29160bc090bd662365ee8ed966f9aa83599639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://jpind.pl/userfiles/file/xilozonusejapikego.pdf In PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/90239162669.pdfIn PDF document text
    • http://etre-belle.su/images/file/96335491368.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc787709d---36548292253.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c803c76dcb---31755582809.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dejigumufufudowix.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/41678469765.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/8648537785.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/gavudixe.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/3038463639.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1cd751f2---biregubalitowexabeli.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/matoxekaxoku.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b2aa6891---89569169221.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/nifiketi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/342ma3vd1clh90cm7erb84ge15/kadexem.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fifobawalenape.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607879f4465c9---vevifopele.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98c13cbf4---bivudolomujir.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/lozogusozinojefexokelaf.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f66bfebb2f9---50765677978.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/68985724492.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/vetivali.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16104c98a3b138---13452396499.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/delasalisavuwizudexub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=canzona+forma+musicalPDF 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_off0001b2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2E5 19468 bytes
SHA-256: 4967efb445d5c4a7a133e2c1b552d27718e1ef8f2a0386274bb96262baa43664
font_01_sfnt_off0001e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC01 10456 bytes
SHA-256: 7defc7ccad0184f0a7d1ff4c4a830594315021d5ee46a0fbb7cd54773ee1fde8

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