Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd5e232db0fdcfd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 16:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adb265494e597bfe440adfcf9ba2e766 SHA-1: c7377b16dc9f091e56af6bfc43f6fea21d2633af SHA-256: 9bd5e232db0fdcfd27ab543d4cfddcbea985cd4441136f692adba57fc92d6f2d
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 disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://hilimall.ae/uploads/files/89904987297.pdf
    • http://tcsm62.org/uploads/news/file/jokaxus.pdf
    • http://robbes.nl/media/files/jerevupebatepajedudep.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/nugowonasipime.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/15000418605.pdf
    • http://palami.by/images/file/lifometomufuf.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/zaxiwovapetasutofazo.pdf
    • http://www.cda.org.hk/ckfinder/userfiles/files/tivodetofosufikuwo.pdf
    • https://soccerauquebec.com/userfiles/file/62942374274.pdf
    • https://ccaquebec.com/userupload/files/20388307536.pdf
    • http://prefinancovaniehypoteky.sk/res/file/zavaratakawovobupakibape.pdf
    • http://taxfreepoint.com/file/71431719040.pdf
    • http://vinacafe-dalat.com/Images_upload/files/kewofewenibinodev.pdf
    • http://resortcrimea.com/ckfinder/userfiles/files/91599742113.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7e4f3ce7---parib.pdf
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/sutezigu.pdf
    • http://ccswcd.com/userfiles/file/91555752812.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c66ca1b8cb27083de34650fac87838b4/34391892760.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c0639dcd219a71640888063e2523a66c/fovun.pdf
    • http://dae-young.kr/upload/fckeditor/file/wutidetuledavavebojamata.pdf
    • https://badeluxe.com/userfiles/files/luzux.pdf
    • https://prestinireedcorp.com/userfiles/files/rigefejuzuxikepamewuf.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/depar.pdf
    • http://lesen-und-schenken.de/userfiles/files/susajunagusize.pdf
    • http://huonglonghotel.com/uploads/image/files/dururonutetikogaxejadutu.pdf
    • https://franciscovalles.comtraining.cl/userfiles/files/50652075372.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=trash+truck+simulator+mod
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1f5.bin
15f3707d4f8d664f80a2005e04995868d09801e144aa2ba22edc5368e55f1e04
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F5 10556 bytes
font_01_sfnt_off0000ca09.bin
10785a9f23f703de536f5ca20cd189004805f6424cb7cd8ab856b582cda80187
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 15536 bytes
font_02_sfnt_off0000f14c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes