Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ec52f138e3f7ee…

MALICIOUS

PDF

75.2 KB Created: 2021-07-24 15:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9584c62669a69bf8d71512d2b5f3ad1d SHA-1: 44c987fe015cebfd27ce68e236b7cedd857f50b4 SHA-256: b5ec52f138e3f7eea145823fd8c97f740880be08c3762897a4fbd78304792320
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://zoltysnieg.pl/pliki_wyswig/files/nibofijijet.pdf In PDF document text
    • https://berbagiangka.com/contents//files/98358091373.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/jagizikeb.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/muwaridukufanad.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96617bb2c---buzivitoxujon.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/90983759011.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/49751405010.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/tujujepururezimodedeme.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ab64d11e---22953179085.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607650c1520ec---95900484654.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/desajodapigulawijon.pdfIn PDF document text
    • http://pjteam.hu/uploads/vasamozebe.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/gonutasajipugale.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b882149102b---fememumuvolagodukiva.pdfIn PDF document text
    • http://hodori247.com/uploads/files/votadajelugilipujap.pdfIn PDF document text
    • http://timapools.com/uploads/files/26772181215.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087aad691cd4---68293862160.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a581385338a---noremik.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/negagaramofofadu.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a60115a7f98138ea23353e5fea514d8e/joriparodowasegutonuju.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/wenawuluxiwes.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/39261048927.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/pazusedazisulazokimabu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pejokiteridemuwofeduganur.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608530eca11b6---malazuvumexun.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/vukulivaperoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+change+the+battery+in+my+pro1+thermostatPDF 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_off0000c3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 15208 bytes
SHA-256: e9de06c65d9d763f77961c0e0a610c68becbefb982724e770717b39aa693e8a4
font_02_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 11296 bytes
SHA-256: f48bf7a4db603741badaa70fadc33b54e824d7f38d20d8e014cc07c4f0d822ca

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