Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fe2bf1a29238a0…

MALICIOUS

PDF

165.3 KB Created: 2021-07-15 14:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4d85c596c6925d689b5ae50e6dbd62e3 SHA-1: ec25fb6c3974917a591bde32edabde8ef67afdda SHA-256: b3fe2bf1a29238a0a7bdd2d4500c4a29346ce249cb820193cf66d092657fd2b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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 http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da30c94b38---74400774091.pdf In PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xogudenabeziluma.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6cb6b032---vimebolakizilegunab.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b77ff421fd0---43540444.pdfIn PDF document text
    • http://gdgom.com/upload/file/210708104749425096x6dzf6so4di5.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/duzop.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wovotedaligodiditunid.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/goxojatadoz.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091a19c79b08---53098190841.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a15c1ffd7b786946e499fd037cd50e50/72834505839.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/57230157245.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/96761171593.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/ginumogumefulef.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa75d6b5e---vobijibap.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0d54ac625---82586668782.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/ranejodiserubebekamos.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ac4ab31456447e67be038c9cfbb6310a/zododagubixu.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/fizazetivel.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e40fc976bf---13686360824.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/kukepilidato.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e05b3b860f---kosasisi.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/53396111254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ludo+star+old+version+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC01 29628 bytes
SHA-256: 9bbf228f87c176af9cf70b6135eb352b07e275520edafaacb6126efef59f15ae
font_01_sfnt_off000233b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x233B1 10452 bytes
SHA-256: fb9fdf1696020db142c2501ea9033aed638b924a51a861e6a9acce25183f7aaa
font_02_sfnt_off00024b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B8B 19572 bytes
SHA-256: bb36c420721bd591cc6e1729ece91b00ce6c15f803edf034d64e81be2c318cda
font_03_sfnt_off00026d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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