Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9476c43d7a5dad…

MALICIOUS

PDF

71.9 KB Created: 2021-09-21 06:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12daa38e02ea09b9dc1f063947f46486 SHA-1: 1fae103d9054ba5382236d645d74aa2a6e946960 SHA-256: be9476c43d7a5dadb3cb8741fa7c8cf061bc98b2c9203106eb456ceae9652e4b
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a social engineering lure, instructing the user to install a browser extension or update, which is a common method for distributing malware or stealing credentials. The document also hosts numerous links to other PDF files, many of which are hosted on compromised websites or disposable domains, suggesting a link farm used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141e08d8338b---xojewelaxegilamibix.pdf In PDF document text
    • http://tianfonmm.com/d/files/biwixunumonupupemuxugur.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/24294643870.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/beguwuremuxojubifubage.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/96847511880.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/84348438564.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390ff67d38d---69683124447.pdfIn PDF document text
    • http://all-premium.com/user_file/files/wapokumi.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/dopevekoro.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/xewuzi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161331a83ded0d---newamopupe.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16146d7cbc9467---xapivudanoz.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/60950830878.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/teredetogerorikekofotuxex.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4d28a8b0---filezibulivupakikiguwisi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ac4bf9c99caf0b822b524944d37978d1/96527710729.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///63496327633.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/vizusi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161493eb6b3690---pezomisupowelolapagadaj.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zenevowavetovizakek.pdfIn PDF document text
    • http://calisnt.com/uploads/files/bowerob.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/wexoro.pdfIn PDF document text
    • http://besteva.com/upload/files/ketoduzepolab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+uc+in+freePDF 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_off0000b549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB549 17808 bytes
SHA-256: 3420c88ad45bde9c866566ee9014d89e5cfce0101ee5f7269a396ebf014c61f4
font_01_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 10312 bytes
SHA-256: 95ea1eb76756fdfc0dcc96f763501a3d0c7e7684d3a49c94d88f4ec9093e8b91

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