Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb944efb7a2ec6d9…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 358e096453ed02c0b7d4edfc886d6688 SHA-1: b9e9714a9b5cc391c0916824738e43c32ae45df9 SHA-256: eb944efb7a2ec6d90043e04ab14ca90e1ce4aa1e862309f5befff39327157c37
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall detection profile indicate the file is likely part of a phishing campaign or serves as a dropper for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=manual+override+traduccion+espa%C3%B1ol PDF link annotation
    • https://whatproperty.ng/ckfinder/userfiles/files/debusubifojase.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac873c09f8---53250757741.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6335cd136---11898307089.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/58593371964.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qfsuj9i0j8lp847qpmtf6svfe6/woxibazobixelikexazofu.pdfIn PDF document text
    • http://kdekdyjak.cz/data/71296562159.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609486cadf433---64190990985.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/40023305065.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/nuvelubuvofatu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/07922d2f31e3c63af2183dbd7da3b2d7/xuxuloxupulidikazavoje.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2a0b0ddd9738b78456f9b13790f7eaab/tedixatetuwuvowofi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aebdecf7a---nirepunibedikotosab.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/56517981082.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6438106e90---xegudipurivedesixoretobo.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/tedetutefugodedovulatafo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b91a146c9---zutakozazujizejirotog.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e2898226fa18395b3c7ed5e6feb8ca23/11174195998.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/52743170826.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcd8cef99---didazebalazisazefoki.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/nejapavepajeza.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/78853622378.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-23/20210823200043635052.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_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 10872 bytes
SHA-256: ef6124cfba50644319b31cba8899afa95df494e50f2179998740f8e723a4d131
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 21292 bytes
SHA-256: fc152b95fea88eed6333c8d296026a0bd63f918c1426e6004608b56877010538
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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