Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4beba9004a011fe…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 07:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5fcaa30d51c34d4ce47915517e860cf1 SHA-1: 7c05982e5763d910968e889952a38ad74f454629 SHA-256: e4beba9004a011fec7905d34619bf00619c13e596bc615328ce3c782ea13bca7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it uses a browser extension/update installation lure, a common social-engineering tactic. The PDF contains numerous links, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the nature of the lure and the presence of external links imply an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e61761690---34898963598.pdf In PDF document text
    • http://deforma.it/userfiles/files/weparasi.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/zusuzezanikovok.pdfIn PDF document text
    • http://getvisa.ru/images/File/63403025868.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/39532201686.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/kujoximonemirikifax.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea59297f04---jujibatunudole.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/revewebipogidez.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/86753152317.pdfIn PDF document text
    • https://unitjaya.com/contents/files/6274114988.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/lejafufama.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/zomonin.pdfIn PDF document text
    • http://inistor.com/ufiles/files/67433676441.pdfIn PDF document text
    • https://anaksemut.com/contents/files/25089985983.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/bujusan.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/87799672624.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/5588390401.pdfIn PDF document text
    • http://specimport.by/files/files/11820628388.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/94648504040.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/dexerusuxaguvaneni.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/gufotijujelimeladapudasat.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/81210363447.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a330b92531ee58a32ca29ce5d2208722/mefomadiziverefatik.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/vatusidimafexazixeli.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/43426459323.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6bef007b1---fugafimugubepajexeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chrome+extensions+android+downloadPDF 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_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10732 bytes
SHA-256: 85f054fe18d3764d5c2bf9585bf18be10cdd19a7e53664f1261df949bd4ce8da
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 17040 bytes
SHA-256: 8051498efa26a811e34600b3dcace492b950017f7b89c5d38686e43703f007ae
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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