Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb902ae155c81b5d…

MALICIOUS

PDF

85.7 KB Created: 2021-08-28 14:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f13d3579d3337d1b5331df057852020 SHA-1: 21350354a7c0b3dc660256e4d6173e704108584e SHA-256: eb902ae155c81b5d50a9db8db661ab98e68965bd1109be840427860172b0f742
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a 'clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for executing downloaded payloads. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://trans-serwis.com/userfiles/file/famumewifodurefe.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/eb16c44f74dade2be37f2522f1d019a9/zodumam.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/54306009237.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081395f91758---30968479163.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc11b9d3f---wanod.pdfIn PDF document text
    • https://securitydm.com/slicice/file/wijexebivelidekosove.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c37928663---18559294902.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/162def7247e20b017a5e5fb7518cb2ef/deririlugo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/64896953438.pdfIn PDF document text
    • https://maisonforville.be/documents/file/28420442152.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/36885864159.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/rubojobarodizizixijesak.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/modidutotobapi.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/fejibej.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/209864d7344d5aff28b0c181cdc201c1/golugijedisidujefadopeta.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/vovewefupatavatumulinupek.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160863e6cc3daf---52400102211.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210706235746791644.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/butajivopewifoketus.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/raxebiwolasulezavedego.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/votepixazekufedikijos.pdfIn PDF document text
    • https://coevent.ru/upload/files/dugulazotopazunixibe.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zojodazomodonadapago.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a698570fdb2---78533781053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=canvas+oil+pastel+paintingPDF 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_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 10424 bytes
SHA-256: 2e52d52620af19b13da2d0c08554a5269f32d3c5f0af57ae55eab5a0c7718299
font_01_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 17232 bytes
SHA-256: ae3ede79e18f4ec9c1532cf73d6558020f00eea7aed5b9b4031f82434a7376a3
font_02_sfnt_off00012fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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