Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed00dc8b496cb493…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 02:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77fc5d465e568a98175fc4f5fbd4719a SHA-1: 548af125a999ca3c3c215a4364fba3f79b712862 SHA-256: ed00dc8b496cb49386d3f855b0eaacc063282ed4c598a2d6c73e3821c69d456c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms on potentially malicious infrastructure. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://mujeresenmovimientoplus.com/userfiles/file/sovuzisaxekoko.pdf In PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zesifafovomivurosokaperuf.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/mupuwolidi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7195db19---zanabirefibinupejukej.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/8061958234.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f0beb9032cc---fapizenaletuwi.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/mefinikejakejowekive.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dsr80023gi0ihiano3n4ict0ig/47584412054.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786589d7400---66798436701.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fc9d32cf---95264663094.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/97562248105.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-27/20210627194436813374.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cf51a7aeb6e86c0f2e5824e32e5b4976/sisonez.pdfIn PDF document text
    • http://eventechsite.com/files/files/rikoxobiwazozuvupep.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b385419b9e7---62925381441.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/minofed.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f0e19c531ffb730c1b7b55e66e7614a8/68448408152.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/jozaluwewesaruzeritanuj.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88e78487---26189431940.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/52674563636.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac917b0ff92---68631866932.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210624110935.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/jivejuputokupagod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+living+bible+download+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_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 10664 bytes
SHA-256: 929dfd43dc38c3dc67c1cb2dd9a57586f5ec483e42e472cc94554a2a7f97c6a6
font_01_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 17500 bytes
SHA-256: c7cfa25847ea36db4c10be55caf73e411ffc3b996a62861ddf2407d0a24b832b
font_02_sfnt_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1