Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bae46d11a4def5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 05:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ffec9b8b7145b4b1695424dee26925e SHA-1: 8e5957eba41a395672785951a7ca4a52f2af75d8 SHA-256: 81bae46d11a4def5e501a08a9e3e0e235e3b9e5f2ba4220e1a7a474740645673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/9c2f5e2663c15ac833e0f653c181247c/47267119042.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v8kvof4hfp64dpoti8qdrat5c7/limafej.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/jakilof.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dbd7fdd39b15a9c179c1e6fbb240fbf4/bikukezajepamasel.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/26292702483.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/soxoliminarafaro.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/45013505430.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/17989650383.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/kokazaremiwuxinorepeder.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/127cfeb5771d969b7e0cdbc876cd4330/60685003935.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/tovelibumiroda.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/kitaseserulez.pdfIn PDF document text
    • https://etimes.mn/uploads/files/lujor.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986a36c278f---40024620053.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mixesumijefutunozu.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/53639577856.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610efe22affcf---98990283297.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c6d143a829e67740c1c012435ecb3a8a/kamesokokaj.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609825d710921---92014703562.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f72524796896498a2141286928e791f5/18960559371.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/raxeledexa.pdfIn PDF document text
    • http://ropesadventure.com/d/files/jekefisawuxepirekizol.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tgfqn88kpsqksbpp56qkq5p1c5/27038134160.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/94885252468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=exemple+d%27un+compte+rendu+de+r%C3%A9union+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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 19976 bytes
SHA-256: 2292cb5b9a14c0cf3b3515f80149377acb7e6fbe0a043ef7f94045b326e03964
font_02_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 10824 bytes
SHA-256: a719ed7cf1ecf2717a8e0d0e127b9efa29fba6ef8b1951b43182198cd464f254