Malicious PDF — malware analysis report

Static analysis result for SHA-256 39549fdf28347a9d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 18:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cd312b092544a8408186e67a7fa0d6e9 SHA-1: b7c9496b5a8c8adc44ee16336decb52f1d6da8a0 SHA-256: 39549fdf28347a9dea6bd5a00174a31e1d6212f6ba46a0aee570485b0c63f058
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://synerhu.ru/uplcv?utm_term=lowrance+hook2+7+tripleshot+combo+manual PDF link annotation
    • http://whuntex.ru/userfiles/file/32438088510.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/23810034858.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/jujapitesefipegovu.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/datusos.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35b63ec766---55061238248.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/37367632523.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8a73e532c78735d2c501de065ea5d987/93224206938.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/88729101003.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/vpbj0a4ai7gbmfc5sofggq55j1/jabezurakowazeri.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f5dc4e41---kujojefukoxogejimiwimaw.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/771100645.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/2054498349.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aa669777b---fisirimolasosewebibexeba.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/34664235615.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/63975893578.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/lafosibe.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/wozeketazanebikojiwar.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/89276012867.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/refubutukopurodirav.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/nudatamuxumarizuvuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ab2d1626---83224532754.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/21991227996.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/36c05655a5c6f213402a0694ba116af5/jixolu.pdfIn PDF document text
    • http://kite-surf.sk/files/47695674225.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/82426186101.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202153061889361.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xosojidupejawave.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_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 20964 bytes
SHA-256: 07b592ecec164ba00b5b3e70f66fe31f48660a0a7616086633dab39c796ae5ac
font_01_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 11184 bytes
SHA-256: b1ac07c80231fd95ecc8d4a994f72e7c5bf158915bf742c5b7e9fd0729c7f4ec
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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