Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc5a175712cb495…

MALICIOUS

PDF

75.9 KB Created: 2021-07-17 06:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d985a71fe27cbfd6e039fe8735781c27 SHA-1: bbcc5fe0f2e20d9d64f853055d23607c36ccdafb SHA-256: dcc5a175712cb495a49d5d47be9f60c8870ca0c713db8fe20e4e8345b8c47fe5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://medsplus.us/admin/images/file/zixoworokewerafufegajim.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073450d955e5---21439035439.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/30825357610.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/dererute.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/04ab815c03aee8498adacf1eb0ec7509/79772943442.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/sivuzi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dqnu7b2ki8nrgkem3s86htss0f/27008001614.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/sgsr4etj0da8hntqg2gkr8cdr7/76378753492.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-17/20210717044756319519.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/vibaxaripibawizuluvamul.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/lowupemusimabejemise.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1a45903a54ff39815bdcf5b97b01b674/37252919461.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6b8a0ea2---87617405204.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/wafinenejijulavusij.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/df62ca1a6b8710a5cde930b29379248e/54986745492.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/rexefili.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/8210033095.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210519211603.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/sopidurupakumodizuk.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7edb21ff1f---nilowafof.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/padixikada.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/vibibilirusezunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=statements+and+questions+worksheets+2nd+gradePDF 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_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 11268 bytes
SHA-256: 8817d9d216c0e3fac46caa4d08fdc8c533cf77eaed7b62e69a8be9672a62609d
font_01_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 16236 bytes
SHA-256: b4a63a0ea044e26f7ac290dc552ea35f0167d87c8f73e4de5f1a381cd603a806
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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