Malicious PDF — malware analysis report

Static analysis result for SHA-256 1274cab7ee300838…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 12:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 807ad13bef03bccfa18119ff7b52d877 SHA-1: 2cad2374a8df9fa8b687ed375227031e0294e7fb SHA-256: 1274cab7ee300838bffe2064789c4548ce3ace1e6957c5a52a19a28b3cf3d54d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, several of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://machnik.net/ckfinder/userfiles/files/walixajuber.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09d928d43---dararixofozoragetaxek.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/90192244704.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210904094828.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/84126722471.pdfIn PDF document text
    • https://langumeistras.lt/i/File/rudagasolujaxamupugugesu.pdfIn PDF document text
    • http://efrex.cz/files/file/vexawimazakuzon.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/loxibenav.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/37254457487.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/boberojaduf.pdfIn PDF document text
    • http://fluorescent-training.com/file/48129626284.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/xigari.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/49935369798.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/riwevaturaxejolopumuduwa.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/xabuvozajosusobi.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/70654123043.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf91832bb---vuxinolulinadopati.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/vubovejigilalirilominura.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/tatepubiwimeniximopusu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c181dcb16e988df1450e2eecd949e6cd/kuvaxasoketarujabutup.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138bab972386---74329026598.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/nadajanitaxa.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/44991782601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=messenger+lite+old+version+apkPDF 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_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 10716 bytes
SHA-256: ab4acda635de41dedf8b610c299266da3c3d8ae4e3be67d0c5f336d000ba2fe8
font_01_sfnt_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 17592 bytes
SHA-256: eefbacfe64762163986cd59274965a39da9ca2eeb9e2e777458896ada34ea5c9
font_02_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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