Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b1af8a49ee1523…

MALICIOUS

PDF

78.1 KB Created: 2021-08-31 02:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d52067fab077e53af809ba05ea8741e SHA-1: 3de2cc63ee6748c4bdd62d0cb1f9be865d42b089 SHA-256: 47b1af8a49ee1523a4ce1a72ed030ed98c940721fa964a5b6db5c37f49fbbefe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://summit-christian-academy.net/scauserfiles/files/6904124865.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb06e61bd---61061739850.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/70289194411.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/lafifike.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/zedafadupodolus.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/bekiruso.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/livumunizaselenokuj.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/tisewiredunabujede.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/82523693506.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/9c622486ba2bdfa96c6d6d36a55d7abf/zazawafejen.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac681b345---71637073760.pdfIn PDF document text
    • http://fourfoods.com/images/files/xomujojopozakor.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/kubumojoxabesif.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tezaledalekit.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54683723256.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e6def42697b78d0ad5b4fd233393b4ec/bezexibakitipidote.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/mafamak.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609471519b238---kakovixuruzujafomar.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/pewerejexegubi.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210621151727.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fbaff71ed01eb91ef51e9326596df238/zewugarimikexotinedegu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dc6fb9fcd---41027483578.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/9607473213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=not+bitwise+operatorPDF 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_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 10296 bytes
SHA-256: 53eb716fbf621f0a269ce120354fdcba44794d6b7e11ffe4f9f197a1360e1643
font_01_sfnt_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 18840 bytes
SHA-256: 3a98a5d09171bf191c1b75901116dba2c9ae385dca10b22f51fc58c63c4f51de
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1