Malicious PDF — malware analysis report

Static analysis result for SHA-256 d026285a0ad70496…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 11:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 115fff792ea542bd8139e76ce0924156 SHA-1: bef2d06d15ee84a00b766ef2a1985ae7fbd338fd SHA-256: d026285a0ad70496768a0b77093b2a21e7a12e87c76b31e065784f4a1217463d
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It exhibits social engineering tactics, specifically a 'ClickFix' lure, instructing the user to copy and paste content into a terminal. This is a common method to bypass macro restrictions and execute arbitrary commands, likely to download a second-stage payload. The document also contains a link farm pointing to potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://dermatologie-chamonix.com/userfiles/file/27780193422.pdf In PDF document text
    • http://xingzhongjing.com/userfiles/file/20210904004701_1057975035.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/21ad57098feb16b29f8d7a3edbaa214f/ropopufupavisofowifawi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/82545006740.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/dixuwavitinowinukan.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/rapoxowepizi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/xifefuk.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/25982443312.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/wovojasigelulel.pdfIn PDF document text
    • https://togeltop.net/contents/files/45476508605.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135440ccf784---68473138484.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/vexewe.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/vasujawanepumusiwalexuz.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/gabupojizadudivotogew.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/30412009600.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/11599004989.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/tukoxolewu.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nupitoxuzuxo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161309078bf4f6---92648800080.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/48540311543.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/dedalorubifesa.pdfIn PDF document text
    • http://wjcopy.com/upload/files/keledopidile.pdfIn PDF document text
    • http://jadeite.ru/images/file/83376342149.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/93611819872.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4fa28851---62438387871.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/nikipajonil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=animal+copy+and+paste+text+artPDF 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_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 10872 bytes
SHA-256: 624c2aef79fa0f9f67bdc61d0461288190738e5612555721a0bea4ee1b6c0201
font_02_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 19524 bytes
SHA-256: b9045bc80bae7ec93f6ac9cb57d3c1da920e32d8cb089123f7a16cc9b9a1c525

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