Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35091dda35b4e72…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 11:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d86ed72c3a531645b15606231cd2a2e7 SHA-1: cd8e0c7d65a0d217d1db918783619e8b4cf891fa SHA-256: b35091dda35b4e7287053e2b024f00617e73261d7decf3b969aba44b14d68ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. Multiple heuristics indicate the presence of numerous external URIs and links pointing to potentially compromised CMS upload directories and disposable hosting. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://nakakinpump.kr/fckeditor/upload/file/28349431438.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4542a69d---telud.pdfIn PDF document text
    • https://blugarden.eu/file/jupobenesuzajizuwitu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03e9b122e---tisizo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xivaragamafinonajagu.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/wutedimowututisikida.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/70622497330.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2925dab9b---75634574116.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/28786313971.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/rupagurukuserafiru.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/52733985193.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993c6cdd548---bufowegalinesulelowa.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/xalesaduvegagikitonutoz.pdfIn PDF document text
    • http://lawyergz.net//uploadfile/files/58312320553.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160717b3a88e8c---46930064864.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/ralez.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/pasakibojelug.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/nozosegiwabifizosod.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0ebf6br07he19qlqgulbammshf/84691136139.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/xedazidasudokavenas.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/38018775936.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hfui25ch2dtrm3jkcmk3smm8e4/piwapawapurekejupozukejof.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/27329585774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=career+path+cooking+pdfPDF 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_off0000d09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09F 10808 bytes
SHA-256: d82fa2204d7d57b7621423d9235fc35ce93bf3e4653288271f1f803e5848d7aa
font_01_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 18452 bytes
SHA-256: 640ccf1495effe5b3009c17adb951db9915d1e6f146a36319535ddef796be7e3

Open this report in the interactive analyzer, or submit your own file for analysis.