Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fdc69326586a7a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 18:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: de5a6a85f6b2729cccb17e9373fb2837 SHA-1: 43611f50312694d25b01503453409bbd2bc02885 SHA-256: 37fdc69326586a7abdbef6add8ec4b003b43baf5c9c7afe1a0655e9fd38da72e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream 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 0.9985

Heuristics 7

  • 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.
  • 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://ibliberia.com/ckfinder/userfiles/files/86795266067.pdf In PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908195317.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/95169905891.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cea5ab3b3---97499804287.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/gofaz.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/waguv.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/boveja.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/48329377247.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/52297070497.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/17129714987.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/xawegozexe.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/35901380325.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/4177230426.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/88362604922.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/figomugubopalanotegazil.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/vomujewebifatofosinutud.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vlsdcqft3r29ikjl9mvgba80ah/befobif.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/gufexedanemejewinefado.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614143e303a5a---8101920297.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/4972122242.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/81557822995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sexy+live+wallpaper+for+pcPDF 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_off0000b369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 18644 bytes
SHA-256: ea8ed4b283f989402ddd83ef8719c7a52e5ae79f58479f77895773550836dd91
font_02_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 10548 bytes
SHA-256: dc487ae6f4ebc1565187b5cc685c05b8d2003a005f383747189b3d17130c99c2