Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe544c52c13af90…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 17:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cba27b9fbe62484c9f94eef7228fce64 SHA-1: a2e8cd96d4f5fc4985b095b9fc34f95832327181 SHA-256: efe544c52c13af90505f2e6e21ecdba31a1834d674e963e8dda99504f3be71a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. It also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=automation+in+android+phone PDF link annotation
    • http://hennel.hu/sources/elemek/file/7508322103.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/mujiwolig.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210908_142035.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/99629729451.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/mizabepaj.pdfIn PDF document text
    • https://rajaunited.com/contents/files/dolufopit.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210902_E12892CF6777F388.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971c76a0fe---36364940437.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/nozadusewexuvalanoxiwige.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6c0045f9166aeddab0dfba55cbf3c0d9/jipofoledumakowoseperasu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba0936151---dasimusunugo.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/14722060252.pdfIn PDF document text
    • http://zzweien.com/d/files/buvumefamebufejodasibexir.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/14f5558d3e13cc54f0fa159ea619adb0/84262192476.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/gugulopilo.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090106043073.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5a97dc8fc9a9f9e44a40c675d8784cae/nozilelujawaraveza.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/dimojagujigipaminitusat.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xijepuwejijixekoxejid.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/moferogi.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf83260e3---favotiraxuvabiju.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/748380372.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/78460883344.pdfIn PDF document text
    • 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_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 17656 bytes
SHA-256: 27add4c6e1d146fabf43967eca10f913a5adbf454071b36feb120c8a5e0ad8f7
font_01_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 10524 bytes
SHA-256: cc79d060ea9b4c8efecf022fc869ee199e084b737142af75a67291bd2c9841ec

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