Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a79e3ca6f85cde8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 18:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f8a15dd70023d6e95d43f652e3af61a SHA-1: 9b211d6da57bc9aca37850652680392a1cb868c8 SHA-256: 5a79e3ca6f85cde8be6e5d2834366767e50a63ac90d092e891459eba5b209097
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://orderkai.com/uploads/files/91495827977.pdf In PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/muzepuwosujumaj.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/datuwopewazonovi.pdfIn PDF document text
    • http://swhos.com/upload/files/givinozusinagezulolizax.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/68242858265.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/zoxukos.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/xutox.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/32727284954.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/2782059649.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/juvixifadofoki.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/wajumupigelofutomegi.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/87832821557.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kibevolabetuwosamemi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613edbea39ac1---lelelumavutakuzovag.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/gajel.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/6117427207.pdfIn PDF document text
    • https://educhina.mn/editor/files/nugakowonasujeme.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/87342855096.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/71406852507.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/69883495296.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312cbe97a6a---nabuguvuwatepunifaxofeze.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0hcm7v87bifd6naisf0a3dhvt6/kegetatidis.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/nerolajaropagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ios+pokemon+go+spoof+2021PDF 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_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 10540 bytes
SHA-256: 8255b802570f39511ad4d99d3af5ce881dc13a983740ba120cae432c050712d6
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 19376 bytes
SHA-256: 81a56bf22abdffe0b55007c43cb597632f326e8f23a055c7db5477dc8f60d935
font_02_sfnt_off0001313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1