Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec8d3df62b12e29…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 09:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f65d6c7e57107b82e3fb70abeba6e515 SHA-1: e7d725e732665c50a2c7016dedac621f463c8bbb SHA-256: 7ec8d3df62b12e29fe9fdeceedbda228783c17aeb3ae34aaec285b6abf87a290
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 ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that prompts the user to execute a command, likely to download and run a secondary payload. Several URLs were extracted, some pointing to compromised CMS uploads and others to link farms, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.ondebiz.com/userfiles/file/81567358252.pdf In PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/nakod.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/16652090154.pdfIn PDF document text
    • http://polletnv.be/uploads/files/feraxufumunegomusinika.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109011525082887.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/mibekisisitufevevuretozak.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/xugiv.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/55367312169.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/39627232496.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/godifiredeke.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/22748252211.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/59362425665.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613854cb16f88---74805182957.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/51907728787.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/65218281387.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3c6c8e43---sozajuronituteritomo.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/xaxelatevop.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/31411577637.pdfIn PDF document text
    • https://robodom.si/files_vsebine/sexubilat.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/nimasigijixedilirin.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/57310927011.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/36941959176.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137573ea4217---33040827762.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/99174023635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+a+server+in+minecraft+on+mobilePDF 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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 18736 bytes
SHA-256: b2fc0476c4b6b31a070e1a1d0690cdf69b10342b72c75b194cf9f85ca068b74a
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 10872 bytes
SHA-256: e0a065cc772872375cecae97ffd3f029dd2d2e50dd226b4dac6a3af90bd6b6d1

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