Malicious PDF — malware analysis report

Static analysis result for SHA-256 be51293b058701fb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 16:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6514025f44286b88d879877d2317d7b2 SHA-1: ca835a83613f9c7835d64c1da3a53172bc51dcb5 SHA-256: be51293b058701fb047df8d65406266183ca887ff8134fb3010f0fe0ea6dbef8
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed for SEO manipulation. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/16dbdbc66afef570c108eeb0a9376882/totiv.pdf In PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/34996751472.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/10427067257.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/63154121359.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/27066735094.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/50653253164.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/2532404632.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2tcgk5l04p84un5u9ii7mtmtm1/waxojizetap.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/zigipufuv.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/todot.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846e3d9cdc5---kevijukufujugerilamitera.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/24126418212.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/durafe.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/db3iqaghg6vffubactg14kq8i5/jidijijumilovaxibipiv.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/migepo.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/difadogotixuvujosezajuz.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7246486563---sadujakujuzubilujuxu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/73950078045.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/fokexufumosatidorov.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/ruvorusaxor.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/20102307367.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/911086203.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/bugiritotemolomuroba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=nominating+presidential+candidates+today+worksheetPDF 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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 11228 bytes
SHA-256: bac210e5871292c1db6896866e0102f0795d9e2967240bdfd801f600f6fa9d3a
font_01_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 17992 bytes
SHA-256: 47db66f187f5be1befe34287d3b21be14f37dfd42aea7f66e370e47bc1402824
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1