Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eef2a0a6e60b509…

MALICIOUS

PDF

98.5 KB Created: 2021-09-05 11:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbff1bfff2c7be2c0cd6b1b43f0c95f7 SHA-1: 9a1582c5ca3c9702fde59ab085d24df1cc2a59df SHA-256: 0eef2a0a6e60b509bae6f21600aadafeb523e589fe32bef4a0af0f105e2c4bcd
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) suggests it could be used for client-side exploitation (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://namhungholdings.com/uploads/ckfinder/files/dodaka.pdf In PDF document text
    • https://mangonebike.com/uploads/file/luxezi.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/pabut.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/44181927651.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/dotupunajozabo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0131970560baf519de33d80bd517ed7c/34020120077.pdfIn PDF document text
    • http://planetamama.ru/files/file/rexunofunuxobomukupudizez.pdfIn PDF document text
    • http://cssh.es/img/file/dabuwaxedowugejosi.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acf7dfdbfd4---99114938673.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210609225515749355lyangv.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/sozilibanam.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/40560898576.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/hlonu1517pemkrbqel69lcdqh3/41187443613.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/87149198641.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/rozagiwarixetamagetelav.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16094845f3f2f4---lipapinesubewiva.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/54608359825.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608611d1bf302---24719193621.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/30107028274.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ae077f151---fupozulebujizigosum.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106101009215488.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/059106eff65be2473bb9b6a5876e3ffe/26326267768.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/moxejitilojuwawafik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=carrom+board+rules+in+tamil+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_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 10932 bytes
SHA-256: 0e5ad5c60a4c0ad246754a936479d36f911aa96ffdae195a304687c3cdda5c90
font_01_sfnt_off00013178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13178 19304 bytes
SHA-256: ce915b8ba8461b90568539e966470057da9a5dde4812cd7a53c462426ce5242b
font_02_sfnt_off0001640f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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