PDF malware analysis — malicious · c4e9899df5385256

MALICIOUS

PDF

74.6 KB Created: 2021-09-23 05:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 8d8a5ddcb5a456cee4e91cf900f8b36b SHA-1: cf5654541a414da33c803ef7a860375b2a1705ce SHA-256: c4e9899df5385256ffd71ff4ace0a6da7ae7a937a8c48e176665920002e72c91

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

Heuristics 6

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://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/37056605877.pdf In PDF document text
- https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/wodixafotififizege.pdfIn PDF document text
- http://perevodvnegiloifond.ru/pict/file/5389906751.pdfIn PDF document text
- http://logicamail.it/draft/media/88145398974.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed729bc4e---jumakarep.pdfIn PDF document text
- http://ameshamagazine.com/js/upload/files/zamolitupobuvozebetojo.pdfIn PDF document text
- http://chanhungcorp.com/images/uploads/files/bewudozazojapedi.pdfIn PDF document text
- http://colafranceschi.it/userfiles/files/bidewuz.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/518a4395e75e5c9af24fa85f57030c3d/mirisidizefalenudevis.pdfIn PDF document text
- https://sma-dfgg.org/site/admin/file/4318892284.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8177a69a---70841301127.pdfIn PDF document text
- http://logiccpacma.com/ckfinder/userfiles/files/fakitipameguxefe.pdfIn PDF document text
- https://bilalyapidekorasyon.com/userfiles/file/88096413296.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/63463099069.pdfIn PDF document text
- https://autosaloncenter.com/uploads/files/fuwimiduxulubugotibev.pdfIn PDF document text
- https://hgindustrial.eu/userfiles/files/33656190806.pdfIn PDF document text
- https://www.weboonline.com/ckfinder/userfiles/files/juwesomaduxalitozopuz.pdfIn PDF document text
- http://budgettranslation.hu/sites/default/files/file/jefiregidisijuni.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16139498c6cefa---zigetukawuribijopibazo.pdfIn PDF document text
- http://medical-1669.com/userfiles/files/ximefufuxoridivoxujofe.pdfIn PDF document text
- http://fygl.net/uploads/file/181522063902.pdfIn PDF document text
- https://finliz.lt/i/File/97118127039.pdfIn PDF document text
- http://inbiosa.eu/static/cfiles/files/tekulunulezoxi.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff03792b1---zabixijarivelel.pdfIn PDF document text
- https://thanaclusterwestgate.leaddeehub.com/userfiles/files/fubikug.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=winter+live+wallpaperPDF link annotation
- http://s250801404.onlinehome.fr/img/uploaded/file/49595251799.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c4b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4B5	10100 bytes
SHA-256: `07f5a18b19a0f50b8b98c12b513485785da2b16c0a0c804595d4789191c6e4cc`
`font_01_sfnt_off0000db5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB5E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f370.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF370	16152 bytes
SHA-256: `e68689280bfc2e6de593be250ba85e6c7c333cf776af88f9d8c9b283a92ecb63`

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