Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be6a31f4025ff2b…

MALICIOUS

PDF

94.2 KB Created: 2021-08-04 15:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16fe1a50b93a5415810ebf08391250b2 SHA-1: 757a6bd6157e041a05d20774ac1960c1cdb10496 SHA-256: 4be6a31f4025ff2b04c892144c693021e0cd1a6778042f9a259abe43c8de5d2f
96 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs that point to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters for redirection, suggesting an attempt to lure users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=head+ball+2+hacked+apk+download PDF link annotation
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/55e7400e6d0dc33418f5625a9bc9bf85/72048868033.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/12087203490.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a38a120f441---favubetutideninesuwalot.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/93929195555.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3028270d71---zodakujako.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7ea865b6fefbf089a528cb7641a7e160/74592962179.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/cf370ea8580873ab8a4dec9858860731/rulilapa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be410b23664---91817110276.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/763f26e44163fae6f821bd9d46b561f8/detinedezarusu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/55504617996.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ae6sbpeofp3l1cj3ifu06gqf8d/zajevefawozutivowiz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160facab038325---muveji.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787659a27d7---gegobubojesuzubawejofosol.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/lezorezumodajikilunili.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1f53814---vunig.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/mukudedegodob.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/42228406917.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/85510191951.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/wavakotafepeliteraxisa.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/43894336328.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4e42ca7a081d4e54311cf105d530fa09/koribiji.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b3d650f156af41d27e4a46318abb3a35/21783455463.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/53431733390.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/34319874262.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/p60o3l8t4ipjvaduvpv271uelm/tovinubiwevoso.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_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 18008 bytes
SHA-256: 50f9ca2cf59f004cb9d4039930c6deca7e8a01de8bed7d01c55e4eb04aebaa6c
font_01_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15284 10584 bytes
SHA-256: 34095cefff7296b2274855c7001f6c3373f2f9a7ef5718a0fc44a0ac99803fe9

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