Malicious PDF — malware analysis report

Static analysis result for SHA-256 601c05f350757ce3…

MALICIOUS

PDF

86.6 KB Created: 2021-09-10 19:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c041afdb0babebcebd78d610dd67788 SHA-1: d5169d6c21c6ab4c9d3c3985d093f663b90136b5 SHA-256: 601c05f350757ce3970a74167359280f1f672a89db80d966a43e1053d5ad83be
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload via a deceptive download button. The embedded JavaScript is likely used to facilitate the download or exploit process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=psone+games+for+android PDF link annotation
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210903044309.pdfIn PDF document text
    • http://exima.kr/userData/board/file/65709161350.pdfIn PDF document text
    • http://robbes.nl/media/files/xuvegaxe.pdfIn PDF document text
    • http://nenorm.com/files/files/fajep.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/48957754642.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/94878726398.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4c95464c---regaki.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c1d55523---21611649470.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/da5e44f0e5f8925096701e9af2f914f7/pulovesibe.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/42957406248.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613992f7002b1---buzibeg.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/dinugulalowuligexup.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/wezuvirijisukogijebi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/rasesusemisafefokusubad.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae49010669---20442609962.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/tabakitewimivizit.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kodurajepobujikakefu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lijafalo.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/ridixinikubozipuz.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/20876249083.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2070cbb6---zugorugululutoli.pdfIn PDF document text
    • http://newmob.it/userfiles/files/badefipefuvepifivaf.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/wanodurifavubaxefatofek.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/filozikobanejevevumibe.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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 17284 bytes
SHA-256: 70204853e9c5209bd67d7a3a71430d0693521204c9eab9b623b435365a097ba5
font_01_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 10556 bytes
SHA-256: cec9a3296ba3fcbf1ebe3efdcc71040079052a3e576657d74b1f8918f4bb9d4c
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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