Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41dc6e9b94e6cad…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 13:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7de28fe9e77420e07382e4faf3882c4 SHA-1: 9761391dbc5055fa5755864155d8d781eedb39f8 SHA-256: a41dc6e9b94e6cadbf971a5888c30719a09b9fe1cf5e8a9143b9a93c9b1b018e
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is often used to download and execute additional payloads. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common social engineering tactic to bypass security controls and trick users into running malicious commands. The presence of multiple links to compromised WordPress upload directories further suggests a malicious intent to host and distribute further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89e2bb0f4---41942184887.pdf In PDF document text
    • http://kameleonhastanc.hu/files/file/kigopuxa.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/59632230379.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f01349a6478---pinunobokanadewivokape.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/03b34ac560554f88ae5a278eb1e68e52/kelawanuzaxibinijob.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/venalawuradumux.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/b3t6gmgh6kp9524nrh5nshm9c6/pawepotodud.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/munemebavujofumesebekus.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/zaloloz.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/dafumogirotexegukar.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26f2290c6---73541324258.pdfIn PDF document text
    • https://recrut.com/files/files/tebepuwe.pdfIn PDF document text
    • https://norservis.cz/files/files/21691047177.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/28083881054.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/88293813270.pdfIn PDF document text
    • http://gestmase.com/media/images/file/95016684738.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/jalevadewek.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/kudukinurafigebubujafaro.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/xinap.pdfIn PDF document text
    • http://www.centralperdana.com/file/wenekenofubijafig.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081f23035946---zirugufunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=create+pdf+from+imagePDF 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_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 17108 bytes
SHA-256: 24fb6a6b33e3a5c473639f9bb36df11e8109bb611f2c561bcf6dd825fe521856
font_02_sfnt_off00013153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 10556 bytes
SHA-256: 48dbbde32c079feaf230c2fdaf32159e11606ff2d87083917e230b0322ee42fe

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