Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe68b059fa015f5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 20:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a9865c45caa0624e2347f950820d567 SHA-1: a49a3d2762224ced2c20e5e771e4e8f85008d57c SHA-256: cfe68b059fa015f559f71382bbe7231a191e24ab3ab4e7b756fa70efd7758481
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains a link farm pointing to multiple external URLs, some hosted on potentially compromised CMS platforms. The embedded JavaScript and link farm suggest an attempt to redirect users to malicious sites or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://castel.lu/userfiles/files/30682875991.pdf In PDF document text
    • https://powerliteaac.com/userfiles/file/wukesi.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/winanago.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/vutefomadabetasawo.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/kavosijorazovijowivugirun.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zulegub.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/niwipowozigilanufexunofib.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/48127866923.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/xisexejekivex.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109101109282880.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109190157299656.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/20372692210.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/1517275667.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/26910110905.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/juxoferumogunopam.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/fedizavanofobezapifoxasup.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/35b8a0b09a326a69ba94edf3a2396220/57445050073.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/vejovideresasoxi.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/diwulufolode.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/71be356abcc78d1b8210bb7d535f5bbc/nivuxupedenox.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161373ea8389b1---mutezitelipozava.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/felak.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/benuxapuru.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/21205508964.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/zivikemirorolodapoziniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cheat+cs+zeroPDF 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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 16536 bytes
SHA-256: 9050a0180992ab0873143eb79460b936d94580bbd93cfbf8cf6bb8f0acd065c2
font_01_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10176 bytes
SHA-256: 662a111155f4176471068d3beef4295aa4e585499b16c1910f26af22b4ecbdb3
font_02_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.