Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16fd557992e6a6e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 23:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30aed18d4a8da70e4d07eca37edf127b SHA-1: f17ef79c90ec974fdfc2287d68fd0b051faa376c SHA-256: c16fd557992e6a6e23e2b4fd8aba3e585d90e46da5a7d275082a6a32753254db
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://www.scsk12.org/policy/files/files/sixazakebigefab.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/voribikamujivezox.pdfIn PDF document text
    • https://themalc.org/files/file/sanobosotinojajiwadek.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/jerifelibotevakeruxejuxa.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/wawesopujitorumafizuf.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/2490356323.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/96818495595.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a7620c9b0---nolavasu.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/37551845232.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/zaboserojikewexigop.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a4730cb1d9dd560bdf68290d3edcc091/ketisox.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/mozakajisaz.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/50259497198.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/4393151098.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/xuguvel.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613616c6e20c9---pibowarawexab.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/85330611257.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/navivelezubofasu.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/xokatakufinesenawiborozu.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/22923931244.pdfIn PDF document text
    • http://getvisa.ru/images/File/jezebimulu.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/88444753614.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/29862112935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=novel+by+nimra+ahmed+pdf+free+downloadPDF 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_off0000b780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB780 10880 bytes
SHA-256: ca4efea2ed0be4051ebc05b0f23997fc8598039a2b5ebe929a106f3b4d5bb5ac
font_01_sfnt_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 16404 bytes
SHA-256: e77811c7f9dad48913e01b9266b5e426427f12de6aff4435403fe5e42df81596
font_02_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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