Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b068b2a0145cd02…

MALICIOUS

PDF

96.8 KB Created: 2021-09-18 01:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39946ea83b2a66285336f0e62c573ee9 SHA-1: 0a437a7f77f4c077306c521536bd645fbf8bf52b SHA-256: 6b068b2a0145cd02b1a859a7f661485d6db169d2057c3ca974e8e0e0cfe38bdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=tamilrockers+free+movie+download PDF link annotation
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/69487037081.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9dfeea4b---23907566742.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/46331806041.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/11509518650.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/28328510161.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/62930029122.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/61847281449.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/sudikefiza.pdfIn PDF document text
    • https://marosme.ro/hirek/file/xusutupibasanovate.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/kakidivibafugu.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/gejejipoja.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/80214442668.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7d4519aa---87505798384.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/11180661402.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/92328273492.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/23906215486.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/zasexusadufirosepubatonem.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc907af810---dusapasosusaxiga.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/97817531401.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/24023647219.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/livebigarani.pdfIn PDF document text
    • https://aaaxxion.info/images/file/32247212519.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/k6tgida1v66e7m5bptefr24vem/42390332247.pdfIn PDF document text
    • 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_off00011743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 10748 bytes
SHA-256: 06b0299869960781aaa88a73b5cfc4e6997022d531f521dd28ddd597efd59f59
font_01_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14815 17672 bytes
SHA-256: 68304e87386661089c41cc333d4a04b061330319c13efca5871f9222dbae970c

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