Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6429fcbb566c57…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 13:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e73827920c39d7d15f74fd2ec4bbd5bb SHA-1: 3d34d6b27d4f69a7af4970ea11b60069af8015d7 SHA-256: 9d6429fcbb566c5755a4ca6675259f645b103be2c613807b7d57d9862094dd45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, aiming to trick users into downloading unwanted applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://branchennachweis.eu/userfiles/file/xibukevifuwedun.pdf In PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/72609986948.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/pusovokonil.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/78581668400.pdfIn PDF document text
    • https://akemi.ro/hirek/file/dazepifoxevepapebufu.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/5185889536.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/rulokiwexodagime.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/7m5tuc6ifis01rd6r58bjpq684/63828395009.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/37576303774.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/59933605394.pdfIn PDF document text
    • http://generaldistco.com/images/file/kunepopubigov.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/64057261736.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/zumubetifofufakekafatata.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/71151465697.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/winejejamujufokepuju.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ed61f7d3472ca83076e5e4c60bf2c20/33441449570.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/46739550725.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/9644550648.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/7347848235.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/34578676089.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/4568479442.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/74283884854.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46db07fd6---92546405870.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/zigiwepifawutamalowumeg.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/befomolijiges.pdfIn PDF document text
    • http://myslizdrave.com/soubory/76631618189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pikashow+app+download+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_off0000bd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD86 16940 bytes
SHA-256: 854e466c90ae6dd4209a2d8c5e0df648ed352f4bd28fc45e73badf3c1592413f
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 10436 bytes
SHA-256: 22228429c2f290c9d718965dedd8f321d02cac957edfb59c729d3bf02acd3ee1
font_02_sfnt_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1