Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d175e3dcb41b9e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-24 08:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02d9dc1a7ba6830f1288d53d65252958 SHA-1: 49bbae1f984cda2a4e4e2c319e19038c0b7ad104 SHA-256: f9d175e3dcb41b9ee42fc22b92b7406e45b36f6e73a4fa2d051bb518c2721bf3
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=setting+up+firestick+tv PDF link annotation
    • http://kientrucphatloc.com/upload/files/fuburuwadalegofilinoxup.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cee4cc89a5---kelemamugazalogonotume.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/58129761735.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/jowisoxenoti.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/liwobekonikolejoro.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/63620321694.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/nevugufawunojixuruniret.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/kenitavikipufip.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/45461942635.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/71495234840.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/41249288496.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/jexuleg.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491028ab146---34773284883.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/73664458730.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/newixitixijagizedakinow.pdfIn PDF document text
    • http://popeyebio.com/upload/files/65430126451.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/72254374694.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/tilifawexoguwunapazid.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109201100344653.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/bijusazixenokij.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210913215416.pdfIn PDF document text
    • http://1carl.com/userfiles/file/70741425485.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/fapowopejiz.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/72rg373v7tsi5jc20ockmeh674/35538644721.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_off0000d129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD129 10660 bytes
SHA-256: 49d270dd765e216687bcc50b495518cccc8a8bdf835d300a8d192b9eacaaa9d8
font_01_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 17844 bytes
SHA-256: b057fbc9e844fec370677abb76f2f954923131a2efbdab89433f138f2673e7dd
font_02_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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