Malicious PDF — malware analysis report

Static analysis result for SHA-256 f274ae48caa68929…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 09:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed67ad55986734d122411acada0500ec SHA-1: 2b6888ad29e142f9ba1c16b279608a7719fc07f5 SHA-256: f274ae48caa689296efb85904c04cea8a9f219ea00cc5a9a676ae3b4dd2b89db
144 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The presence of a security bypass instruction, instructing the user to disable antivirus, strongly suggests malicious intent. The ML classifier also flagged this PDF as malicious, indicating it likely serves as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=download+raft+chapter+2+android PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9940180e1---lefedexuw.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/57681861589.pdfIn PDF document text
    • http://npas.ru/pic/file/wozogugijat.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/63927732021.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/lovoderenapusijajijafa.pdfIn PDF document text
    • http://www.bandungmesin.com/file/xamuk.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/33171529258.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/lorulag.pdfIn PDF document text
    • http://tiquital.com/documentos/file/63364998814.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/fozutibox.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/51184398867.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/famadalasefab.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/58143782830.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/91876967265.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/pisinix.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613324b1092ea---38093460691.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/2429004349.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/pexubejirumosuzibobin.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/sopusokepaluwiwulowi.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109040849051651.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/30872921070.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da0688ea4b---85111608329.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14842d853---12904019362.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/piwudukabejudakozewik.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/lifele.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3417380a---newol.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/89659564881.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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 10756 bytes
SHA-256: 0adc964985a4826f780f9dbbace79e788e93053ed6b3219769e95e0c5b875ee9
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 18740 bytes
SHA-256: 5fd4e66aa202b24a79e61f432f89d838920d422f0f6ee6bd03fa9c603dfcf30b

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