Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b437536961cd22…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 15:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0074608e9973646e160618043e961ecf SHA-1: 2ea1d70eb8b49087e9c66f19b6819c89e3cc1fee SHA-256: 44b437536961cd22c33d2d72685ce02dee9808ffdee97dfaceb962be00e9a482
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The embedded JavaScript likely facilitates the execution of further malicious code or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=last+season+of+twd PDF link annotation
    • http://sanalights.com/admin/admin/uploadfiles/file/wesisemuxogab.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/fetolajolejudamo.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/tikorogolojifajukosov.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/fidobozuj.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/mesijasakadagufapumiken.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/popazabatovujunasotokif.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/83473559087.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/dujarobakuzafa.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/55345570448.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/fiwezera.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/vesavapip.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613966b76c49a---21044764263.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ededbc43f3---47436463786.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/jewatux.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/tonezotidejuxevidu.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/gitenuxatixagugeran.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/narexevusesubobusozota.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/getixuse.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/55147119803.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8143af784---74802843635.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/latunukasexolelix.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210922195845_vkjiaw.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/98222628291.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/depiramoruminure.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/50163954194.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_off0000b395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB395 18256 bytes
SHA-256: 39c3a9f90a048cc88cfa7c42dcf312eca88c54f6da33e1f751043baf248d6266
font_01_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 10152 bytes
SHA-256: 54c7c606a5b854ff1f5bc572cb1a115c16108c7bc86e85078234f84dccbe6609
font_02_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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