Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edc8dfca6f031bf…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 03:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b8c8c1799389eaa989c2b452f8c635c SHA-1: 12583b866df78abb39c90fdb1ac02395f6e1f9d3 SHA-256: 3edc8dfca6f031bf5e8797e72adf89057a6d79b3c9db5f87eca031453e951977
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://queure.ru/uplcv?utm_term=free+reading+comprehension+worksheets+7th+grade PDF link annotation
    • http://kirilmazbardak.com/userfiles/file/pivenuzekutozisevu.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/24702892999.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/47104369853.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078d344b4ead---telebuxazafetisugopesuje.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/32810995887.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/93548116077.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18764ff5f---32006528792.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/aa979eb80c34e54b92c585fb49040b0e/xifamabawu.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/xetasuravokixob.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/35193483424.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e84c80b165e52e5198aff0fe25b7f281/54609798634.pdfIn PDF document text
    • https://filetorme.com/upload/files/66325115365.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/70779629517.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161082684ce888---77895711282.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/xinejeviluvopiri.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/zasorinoxuserirufebevufuf.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/felawinewuwegigado.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ec5629354a4a69cf5bf182cd75d35323/gafurafale.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5ae64b2c59600290398d2f7700b53487/68190773361.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/33686702716.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/55725406029.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160813a1e91604---78706209353.pdfIn PDF document text
    • https://premiersuli.hu/files/files/21246172847.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/naxulidotubijemo.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/dulezenolive.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b6f6649678e1b539fa7eb98080c794a5/kilubiwile.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/57526902152.pdfIn PDF document text
    • 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_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 16884 bytes
SHA-256: 086d234e1825e8f04f05af94d90b3180c8220d0bc725362006e7a22818063ba5
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 11120 bytes
SHA-256: 75de1e2740d687e07ee81524d70274e425cfc96bdc74d0f39b14180e13c550ef

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