Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc73bfb582d2c93…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 13:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d8dd55f23055b636947cb1ebe4bcdde SHA-1: 9bc1235910b8249f5d6f970eb7880dfd86871b92 SHA-256: bfc73bfb582d2c9383794aa5d11a546c9f296b3e978c764a50c5aa0d59b64f49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://spokoino.ru/i/upload/files/nagavenoximubilifuriw.pdf In PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xifojaxi.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/nezutuniwigimumubikog.pdfIn PDF document text
    • https://ienter.bg/files/83680846692.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/12132253766.pdfIn PDF document text
    • https://krusomying.com/data/file/naxuluwogazaginatutira.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210904_FC7265789A466821.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/61065331185.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/rumani.pdfIn PDF document text
    • http://geose.ru/userfiles/file/tuvivaxamelisibugogutuxop.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/gisuxuboladoxukerelelane.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/runub.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/revuvudaguwolivetipozavup.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161398643c45fb---29082426309.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/78541029171.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/velalatapugagigoxem.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/31030352194.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bt69657itcs2n07mcil4bspn79/lopegopijigelutoge.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/40972474925.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613680addda79---31959511988.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/598c68c26b075c7293aa62432f6460e8/giwopadikugawuponakotogox.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dabikutogamor.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/40270936541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=avee+player+template+free+download+for+androidPDF 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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 10740 bytes
SHA-256: 29a8839aa74a9f153be1c0e4a99aa799d9dabbc32dabc4805184a779ca30bb4d
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 17224 bytes
SHA-256: e227fde3cef98a66e0245c1844013268032a745b989c0af820ca8e11912bb31b

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