Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54766d2fd6b6cea…

MALICIOUS

PDF

88.0 KB Created: 2021-09-18 19:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b33256c33b2701f1ccd20e6a2348ee01 SHA-1: 0921f8e994a3598c3e9d9cd90e11c4e19b272085 SHA-256: f54766d2fd6b6ceabc401c620e0ac4a1d81a18c086121c64ec7fb381f04bca48
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it's a link farm and a lure for remote-support tools, instructing the user to install or connect with such software. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to trick the user into a remote-support session, likely to gain unauthorized access or install further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Remote-support code/control handoff high SE_REMOTE_SUPPORT_CODE_LURE
    Document asks the user to share a remote-support code, connection ID, or allow control in the context of remote-access software
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://clubsecurite.fr/webroot/upload/files/sadaminesemekusoninikug.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/611h4ahsf5t6albuagm1lpn1mj/6630911886.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e185e691---47679720589.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/4903365053.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/38858247703.pdfIn PDF document text
    • http://njchemland.com/upload/files/17919946648.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070428017775.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/29676341434.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139caa14f12e---vulakav.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/16095611346.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613603b02dd0c---96623363228.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614086bdd4417---poxosibavekijavenawidufog.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/jusafesu.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/pebesusokukidaredinu.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/92095222981.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/2415626788.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/90007302219.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/19757829129.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/kelexi.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zujemawuxereveto.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/kedagokegawotefemodov.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/babezasijelofevozawupe.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/wazesewadana.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/16932151723.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0e4500f04bd51cf8543500179f154cab/nipavagale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=change+android+device+id+without+rootPDF 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_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 19008 bytes
SHA-256: 623f463ce1c81c65c1f8d7ef4335812585576339e6a1694d9743c9b30f6406a6
font_02_sfnt_off0001396e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396E 10716 bytes
SHA-256: 0bb1f8fb7597dc0b39833bc44e805cdc7c202cc326c240fd8e4040eda1001c69

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