Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70b5173900298f0…

MALICIOUS

PDF

263.8 KB Created: 2021-08-13 04:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bca6a3532943b53f4d6a7bd6e557a80a SHA-1: 948e17b2f497adb88c2f117875aa5c32b6baf3f0 SHA-256: c70b5173900298f044a5fb09b3b6e8c9c49f212ca44c998e869084148faffef8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. It also includes external URIs and links to compromised websites, suggesting an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9318

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=sixth+grade+6th+grade+vocabulary+worksheets+pdf PDF link annotation
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/23726858868.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2c6d98c48a1eb9f8864f7496d549fc6e/76012422075.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/51727819320.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/kmpc3al548pr0qkf0c5dsk8p7k/jizazoperogaxitu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/af4cac36d30f2ae949aa60eb9c709b88/52776285309.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/33263996843.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/19777180397.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd357f4163---bogani.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/aae410c847c1784cb52509ec2e543091/jexukomegejilujapas.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d47bea86944---96968090007.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/bexujodefibobut.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9ul3773le6ed9smooklj8sqmbk/wowatuwiwapi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d94cfe47---tujamoruji.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af538b6d7---66017857254.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/sixukugagezazuwuxufilix.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc9d1f3e5---kizusumuwi.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/14458161319.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tusububovi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d722791677---25034394975.pdfIn PDF document text
    • https://advik.net/userfiles/file/57595923520.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9b53bbbacdb8dfda4dea81728d84fb8/29631118137.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_off0003afb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AFB4 16836 bytes
SHA-256: 0930bd277a22940fa555f8e9d97f19b15ec93f37e71be3d6f6765a08d76d27e6
font_01_sfnt_off0003db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DB5D 11736 bytes
SHA-256: bdadfc1021e6edac919da5e469f21f6cc0aea22fa4a59e0891061f9f61f55049
font_02_sfnt_off0003f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1