Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acc8feccb5016c9…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 04:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d39e0c9885afdd36f44cd43384a609c8 SHA-1: bef9f384beabaf131a93f7c03c539f75a1a48e38 SHA-256: 9acc8feccb5016c9529dc1e2fc177635cd75c278db6c6bb0cef8d00e89d6397f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. This suggests an intent to phish for credentials or distribute further malware. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.tcf.gov.tr/ckfinder/userfiles/files/47580457863.pdf In PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/s6a00vk4vn1imhg9554455h9nj/25587281964.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9548fb4a7d484bb3933d32026ec45cd6/xajugazifugokisanugune.pdfIn PDF document text
    • https://marosme.ro/hirek/file/17217220393.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210620101713_8lpo9h.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5639ffe5---mojonosamajovejexedaropa.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/wixejuzesut.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cfcc96662---7705769546.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/nononuwezevavoxetu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/49ebef1f9e31f37a4da2788ba23147e8/sugarup.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/zekogazumizunirunulonakab.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/puwujapibobofisulikupag.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d5cafce6---namekaxasinalobamo.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/fipaj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8b11f27---69804606986.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2b04e00f7990e2679021b384e75b55fb/bipanatiz.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/22258216987.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd9b29fab0---gulides.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/63028769285.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/28075898154.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/25313414413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=graphing+horizontal+and+vertical+lines+worksheet+answersPDF 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_off0000bebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 11136 bytes
SHA-256: 5d00444c2b0171a3ff926911e3cc00315b9a31b8deff79549bd0749e0e64b629
font_02_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16720 bytes
SHA-256: 8c20285addd50fcc779f8b4056c39eb8a64c57675b94635ab98b2bed7e35fe2c

Open this report in the interactive analyzer, or submit your own file for analysis.