Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9654b467bda4291…

MALICIOUS

PDF

81.6 KB Created: 2021-08-29 01:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 521bc6b39338d7d79a4fe11f279e82ff SHA-1: 6c81a0f3c2e5126bb80460feca65c5ac98e29e59 SHA-256: a9654b467bda4291ccd9b6e72e0e08bd95948cee302347a4cc5a492d28e2aaec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and link farms suggests an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://s-privod.ru/userfiles/file/70344053401.pdf In PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/retowomijemalaki.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081662ff2ce9---dasigavadadigolunobi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6565938bdb---51793919173.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/62297142719.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079faae58953---xipuguzizumojosepu.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/kapitukunatoluzubipowijoj.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/lugulagepegujus.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/jobelatirenivojowu.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/77924534667.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9bc90d740---vovek.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/xunagonazonog.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/sufirisoxerakorew.pdfIn PDF document text
    • http://sbkf.org/files/files/benadutowa.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/23413487960.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/fonovolowi.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/22837604783.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/527c649ae94506269bfdaff9094558bd/88569533017.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/17466435547.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/82147330715.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/40932147915.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/nariwukolib.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/kakefu.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/lebirowelodat.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/jurisepebuvifuxufifatew.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/41265155384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+book+of+mythical+beasts+and+magical+creatures+pdfPDF 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_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 11476 bytes
SHA-256: 2f9733423df1abac73fc1a46ad0ba5c55df1dd5cf537e2eb2f2fbabf2283e07d
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 18796 bytes
SHA-256: 84e79e8e73bc03dbae3d77015b3536984f3947bdeb71819a84b7efa911ffa81f
font_02_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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