Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcced1c0d50ea78b…

MALICIOUS

PDF

81.3 KB Created: 2021-08-09 00:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2312548b3c6127975f5ca59723c97c9 SHA-1: 589dce790c9c068e30594e4bf3f406916df42711 SHA-256: dcced1c0d50ea78b5db2b24ceeb38cc7b29b887c54b4a31d96214a424d1f354e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/bbc8c3808323ba17612aa70cc7d564e1/fovunujezimup.pdf In PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/sevunawesum.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5bmsmc20ra2b6nce6acej8i5s/gowewumuvubixavig.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210626221508.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160974d8001776---16058226666.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/t288d1ipbf3tcj48dk389nlnp4/56875412859.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffdf75584---tilefobevudogo.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/rupakedifosidakapiw.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/mugaralazojex.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/dimowakume.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad22c8f37---bobexogipigab.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/338f5df6f3160802ee3ede696c8223db/fegexosanoparobopiwekudux.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/45169388381.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/80208407148.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/83745181690.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a30291a11087044e50e12540a738e48/gatufudugojad.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160818ece1fb4b---41048770378.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf733dd27---sevorixikatadit.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/25256885687.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/muzogilalezifenuziva.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/73229641085.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/68384774393.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/56745495516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=iphone+ringtone+remix+download+mp3+2019PDF 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_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 11444 bytes
SHA-256: 6310fb03f76d554094705024eb8376c3224aac8aed38cdc8e77b1dc153653a70
font_02_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16500 bytes
SHA-256: fbc45a78872fa2fd571e7476f7ebd84f68651568a15d2e43996897bfb6707896