Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c358796588f9c68…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 20:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21915c591eedc1128844a1ccef2c4f10 SHA-1: 15fd57013705f41879daf1858c68a1a001de0c32 SHA-256: 6c358796588f9c68d11f0552183a1f57bdbf07c72207e8def2a80a04e69f6b01
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into phishing scams or download further malware. The presence of multiple external URIs and the classification as a 'Phishing.Trojan' strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cructi.ru/uplcv?utm_term=hip+flexor+strain+rehab+protocol+pdf PDF link annotation
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cc5095210b4517c04ac268f3c60977e0/78195811038.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/roxevedusalesurovemejoni.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/l6favathoalvf7nlbgskpac7r8/remilipalibof.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7b357e23---basonesofenalipemibat.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/36727043161.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/d2v80hlcq1fgfptv2cjdbktap0/buxonuxapozatulodosi.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/mobojokiwijuw.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/44c6dc4a011731d9a8045b93323eced4/42447271763.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab055c5a486---xaviwepemusosufed.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/sufegubeduwazoje.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/87676537210.pdfIn PDF document text
    • http://pnalog.ru/images/file/18479287407.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/raweme.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/7433913215.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607475e5d7b13---45264859453.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/16658928387.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c18ae0594---59900499667.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/59ce050f499d05d0359b958a880cccdf/xowavo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7b6a1ec2a2e8267338ad707e304ae2cf/xavopufovoro.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/siwojarinogone.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uqv8sogkg05qf8ia74fpndotk1/20771200873.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161100868ce276---99725866860.pdfIn PDF document text
    • https://fallsplat.se/file/42351816146.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608fc8b8c1288---zaxawewojeta.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ivn1quu2t3pll8uu6155r1u2k/2484166515.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b87305d1d33---97176165218.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_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 10948 bytes
SHA-256: 128be22ba541ed6a4bf767d38253d571281797d934dda633cd9d4b0a20ccaca3
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16768 bytes
SHA-256: abe26044a7bb36013175c5cf8ae5011c30798eef9dae7f5e5267aadfeaa62168
font_02_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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