Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2bbd89c11b89ba…

MALICIOUS

PDF

101.8 KB Created: 2021-08-21 13:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 617c0c04e6bcf6cd9e4dd974022d7197 SHA-1: 7bb7f43754094b9dd67083fcf98b254a3446947d SHA-256: fc2bbd89c11b89ba530b6cd3de66bed4642d362c8f6aa98d4af39eb3c90f9126
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=elite+dangerous+mining+guide+2018 PDF link annotation
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/scsstnjg4hm5o7jejoc8skduln/64108263702.pdfIn PDF document text
    • https://panama4d.com/contents/files/dibibi.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/35567932505.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/62045711947.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5aaff34---kafopoki.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/nipegusuwipirolimo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0c7228fc---pikewenoxozojadu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/topidikovowemodaxeka.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/163778de0165f3faeb44a18999e6f181/34807299954.pdfIn PDF document text
    • https://langumeistras.lt/i/File/61785208421.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/supofuxigogizob.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210724140309_1r060w.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/kiwovenefegu.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/2522325383.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/desupaxit.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/bejimikudeduvu.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/velitawagazadonubavekomew.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/33584457538.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/nalefabafinonumedatoki.pdfIn PDF document text
    • http://agavietnam.com/img/files/8775883326.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/72537486457.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/94033225642.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xuwafiroxexuretaxalubupo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/26em7bmf9hhtosp3p6ggktvai1/18610141563.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_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 16232 bytes
SHA-256: ea42d268f692f1f3f2c7d859e1b95aaf2fb4bf154e37463bdf3dcc0c40b00505
font_01_sfnt_off000155bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BF 11176 bytes
SHA-256: 2d554ce2434cc4208f37c7a5b586188d715f69de923e9d02ccb8b73590214a74
font_02_sfnt_off00016fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1