Malicious PDF — malware analysis report

Static analysis result for SHA-256 2234b3b4b312a094…

MALICIOUS

PDF

68.9 KB Created: 2021-09-20 10:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e0568cb5e383d28d52e485aa258c0401 SHA-1: 9a80c89a1f003feb39ddf37734dd9c4c8bf1ee6d SHA-256: 2234b3b4b312a094e8805de9fe9304b51043b3dd0ebc3130f0cc0406cbfefe81
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites or are part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5522

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.
  • 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
  • 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://mrpressconsulting.com/UserFiles/file/33622029659.pdf In PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/1701034289.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/58972171361.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631731083.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wafaromepogarevonojomi.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/63106582341.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/8845020783.pdfIn PDF document text
    • http://furniture83.com/upload/files/73299229800.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/mezimubajozop.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/45811634468.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea578c2440---58551863565.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/rogewamejobupezorobafif.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/21932848727.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614181b7a1ca8---pufijubixisoxodif.pdfIn PDF document text
    • https://ijp2.com/contents/files/23258153366.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/97195450717.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/gefabe.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b89de50e105e8ed5d9df537b11f8df54/77841704130.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/3102442470.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3fcdc4bf---deretasodobaxizeku.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nunumi.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/xizomura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=galaxy+store+windowsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 10584 bytes
SHA-256: 6013a6fda7e51150c01f46ca7410414f21a55e855ca4e0e81f06abab0d827b8c
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1