Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ea9fcb18cd4bd4…

MALICIOUS

PDF

85.4 KB Created: 2021-09-21 03:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 595ff236a7cbffa5974e7c4627ac9af1 SHA-1: ee546b79d9d56b9cc6d8c610d62af23f9e6d1dd5 SHA-256: a2ea9fcb18cd4bd4d95445c7ee5cad1ea19f1295f97f7ea738fd47640dad5acd
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external links, many pointing to compromised WordPress upload directories. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common tactic for downloading and executing further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+restore+deleted+music+on+samsung+without+computer PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613076d74f023---pujil.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/tuzavenulosegan.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/62598255866.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/79934900084.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/nikisufejojigu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614900ccb87fe---15927903548.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/sejamu.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/jevuridibetonakud.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/vexipexowopedonanumakutet.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143422ba77b4---33217934329.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/99979838388.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/67861251025.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/59486229892.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210915_AAE2C722033859EA.pdfIn PDF document text
    • https://andana.us/files/files/sumejofavelozexukepot.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/60541911641.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/jajitudagis.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/kovutivapoxos.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/kapoturuxeze.pdfIn PDF document text
    • https://x-software.cz/data/file/80920023807.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/66199266732.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/2234364879.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/92274362647.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/lepawibajoteke.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/lunugojizivudutipaxirewo.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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 19196 bytes
SHA-256: 33530870b71a1b3a0d722aec4d225106c08e18a11b20e8fcb5c7d49bca2d3510
font_02_sfnt_off00012de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE0 11140 bytes
SHA-256: 7eba471e8f83f2921760c8a7621b7d3c4dbb84146181551098bc1ca597bac98e

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