Malicious PDF — malware analysis report

Static analysis result for SHA-256 9419c2b52df8e2e6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 15:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e9f54fbd96e64264abb6265b7e2eeb2 SHA-1: 0bfd238c5acd5f8f4d2c115802602c199da20ca4 SHA-256: 9419c2b52df8e2e6877d59984b5be2536f93336a0211b761cb1542735048086f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • 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://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/4724919522.pdf In PDF document text
    • http://ladyqueen.it/userfiles/files/fufevimogotif.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/88071796326.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pavuzawamevomi.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/74277953673.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/fenoriwuvarive.pdfIn PDF document text
    • http://scpt.it/userfiles/files/tanexen.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/denosige.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/26018359766.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/nowofevijudipalaluni.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/tedapi.pdfIn PDF document text
    • http://iviltra.lt/images/files/razidezaverilolevonezu.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/tagokinedamoxe.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/takutefobuxuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420cc338029---62473343751.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f2e876f258203308751273b006bcbd41/6741093011.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/gonalabamarupatumosila.pdfIn PDF document text
    • http://etkenkalip.com/files/7979722790.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/68024125996.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/12917205073.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210908014809.pdfIn PDF document text
    • http://nanopena.cz/upload/file/33968294474.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4dda934936833b072317833d385cc5ff/falakikav.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/37734012219.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/35070613668.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/75842759427.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/21966678345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cs+go+case+clickerPDF 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_off0000ba3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD255 10324 bytes
SHA-256: 46dcc2f46abffa5ccd5f25582a26ee4ddef32bc734cb247a4645e9de72ec4b67
font_02_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16572 bytes
SHA-256: cda4a51b74fbb268a823c24b655b702de62d980e5dcd62a9a1f88143055447e2