Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b45363447de9e3c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 07:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cbe223e5442584a61bc2f2621dbc965 SHA-1: f9fb82be8278775d819d6eb899b105c1ccb6885e SHA-256: 6b45363447de9e3ce5836c469cc2cdcf8efbab63309de43445e22b02910d9ec3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier 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 0.9912

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://irlanc.ru/uplcv?utm_term=room+de+super+nintendo+para+android PDF link annotation
    • https://sausalito.com/wysiwygfiles/file/36129986420.pdfIn PDF document text
    • http://rs-entp.com/upload/file/47593592868.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/57412365548.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc4c0ba514---witoza.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/bovulexuwo.pdfIn PDF document text
    • http://rsst77.ru/upload/files/gopikun.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f21b8670---96374771859.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/kasunafukemirabewe.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/jemodedisezibepuvozovunu.pdfIn PDF document text
    • http://air-con.ru/upload/files/guvuba.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/zewaruvelokokebarinapota.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143b27537cd6---zinipefereji.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/kapepikutozebexuzi.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210908212726.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/vilobajizobevukulolo.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/jogaxeravazilefamanapesud.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jadifuvojo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/117451519afaf4b5fbe036a9ad8f0540/kirip.pdfIn PDF document text
    • http://surtek.biz/image/files/20150318_023638.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140344876def---89081092940.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/99907870989.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/92757943003.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/tonuzawapewifabuvazedo.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/sojimexuroti.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4793409b8351fa656100b7d688646d8a/98863338289.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/makamedukonepi.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_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 10652 bytes
SHA-256: 89a219aa69786d92bd8ec862cb3d394bfdb9e716badfb4da16d856bf517c55ef
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 18940 bytes
SHA-256: 95436e39bd37f5ee5ae04a4e58c867ba8377a0ac06fba9c8a7a47e6ad90200f3
font_02_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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