Malicious PDF — malware analysis report

Static analysis result for SHA-256 359992c95cc5dd44…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 23:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2fee2ab81b980cb867d231918ce2d0d SHA-1: cd865f74ace1cf5bdf6382fbee5e2f0a1693127e SHA-256: 359992c95cc5dd44e736fd503f21097b81b5bc33b3a630a89b672b1fa99f9c35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://propertiesforrent.com/userfiles/file///80226942395.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d1c7b5b73c11fecc15d8c22947b8fa71/doxililafuretusokaber.pdfIn PDF document text
    • https://bfull.ru/uploads/files/66525131191.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/15577440913.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/dajapalerelo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee4b04f93---goxetanefon.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d5046e47b59136aa6c1f27ae18ffe71c/babemavunikesofunakudowu.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/78712323807.pdfIn PDF document text
    • http://yongqingtech.com/d/files/51988420679.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/bebutabafefanumixesuva.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/numer.pdfIn PDF document text
    • http://www.buildonhope.org/file/kizoxuboxunagozifab.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/8739020277.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/74345873377.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210913_A1722C8F945102E0.pdfIn PDF document text
    • http://jcpingie.be/public/files/65827849873.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/80913428943.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/jakipi.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/69711099392.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210913124348.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/brpsaq9kr9qgko76s9kp7nc6bs/33153921973.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/fubobejixoxumupe.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/dinolupudizevepakobil.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/mogokuwusoterugurada.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141577b5db83---daxoxolowofazuxuvir.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/mobenadetirajep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cricket+exchange+app+mod+apkPDF 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_off0000baaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAA 10972 bytes
SHA-256: dc3cdf1c054feafdfaf533e7bfe515e90b227de848a4c44994c5185520d579fe
font_01_sfnt_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 16216 bytes
SHA-256: aebf9fa3f89f186134b9e2a6bcdc37b95856005651e3d5b57bef49a72ca5c6a7
font_02_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1