Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91d6cdf6cdadf5c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 08:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 193b985b7664a48c53656137934095b3 SHA-1: b81e84be6b2c8673e458590178becaf5351a07c1 SHA-256: d91d6cdf6cdadf5cef0bba9c119ba44f50ffb01d2520f230bee450937bafe5a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=cafeland+offline+mod+apk PDF link annotation
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/73715543187.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ucsrfj072nplt050n6skefbva5/61049216006.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/39006559323.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/talugoxosimeguro.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/64675783110.pdfIn PDF document text
    • http://cbstav.cz/file/nexaveverimolos.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/mulijiferexojelawego.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/25bbd474b4e3238b2868af95e48d472c/59731878368.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210908054617.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1547ed30---10247847239.pdfIn PDF document text
    • http://guchen.ru/d/files/24050796994.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/ruxometinesonejexagulunen.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/basajalipapunabevi.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/lozilopemij.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/lizelumixaxe.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/69202112110.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/dijaxumejolaxasezo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146c6e723440---34847163888.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/86777972216.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/isgn91srmbcfnv5q1609ue0o4n/36114761337.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/lerori.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/87378002446.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f666b63f---gozojesojo.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/62558508825.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/72df9a7c7e8b781101f6c93bc9a7751d/jutiwin.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319c6831564---93306375447.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_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 17736 bytes
SHA-256: 389bdbd7adbcae2643d7633a92a4397c24ea525dd73ffa31b48637676c3d1a43
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 10416 bytes
SHA-256: e81138978af172f3beb4589c54bacf559e6a9fef85ba611dd70e3545405a7d34