PDF malware analysis — malicious · bd893092a8949e13

MALICIOUS

PDF

99.7 KB Created: 2021-09-01 09:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a109d9273edc1b6c65ddd6e52875de1b SHA-1: c8b32f5231c28f45d883461dcb3aab7267e61319 SHA-256: bd893092a8949e134d2c8fc0f525d0307b0d0e0b092683a90b1fb90d5df984f2

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Several heuristics indicate the presence of link farms pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or download further stages. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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 http://veganogle.es/uploads/ckfinder/files/27543718416.pdf In PDF document text
- http://jyjwqj.com/uploadfile/file///2021071916023776.pdfIn PDF document text
- http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/32582431187.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d40ab80b797891d09f1d6699e8d8fb04/65350838809.pdfIn PDF document text
- http://ateliergermain.club/sites/default/files/file/2251524085.pdfIn PDF document text
- http://capmar.eu/userfiles/file/sikakaluwojuwi.pdfIn PDF document text
- http://czerwoneiczarne.pl/files/file/92338362619.pdfIn PDF document text
- https://gamepinleri.com/calisma2/files/uploads/veruxejasimapojuxo.pdfIn PDF document text
- http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/pivunoji.pdfIn PDF document text
- http://szerecsen.hu/editor_up/18889333839.pdfIn PDF document text
- http://snnet.kr/board_pds/fckeditor/2021/08/file/62863817562.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5fc4b8bde21a11c878a92ed1e7aa51d2/xodise.pdfIn PDF document text
- https://tourgardan.com/basefile/tourgardancom/files/86172582506.pdfIn PDF document text
- http://immobilieninvestors.org/userfiles/file/gerumat.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f6d61ca1028517b148ade87908425524/57591294519.pdfIn PDF document text
- http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10573886590.pdfIn PDF document text
- http://amdind.com/userfiles/file/geverikakuzusiselijelof.pdfIn PDF document text
- https://nbtele.com/en/cache/fck_files/file/zorel.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3c6556d365f39eda8577b0befe3da242/xuwatajorez.pdfIn PDF document text
- https://guineaservicesproviders.com/gsp/files/73893776580.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6640d188b3f47cd171d0d2a1c5cecb30/92915943505.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd930bb75a0---vujutebuvedok.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2cdd69ed8---87559845417.pdfIn PDF document text
- http://szentimresiklos.hu/upload/file/vujarujiduzoxonokope.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=syrup+water+for+cakesPDF link annotation
- https://grupo.iberia.com/js/ckfinder/userfiles/files/39630037045.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_off00011c5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C5C	10700 bytes
SHA-256: `98dc6336080f85fe791adf00aa54b7e6d1e1483d5ee599be47c37a14e2cd42ae`
`font_01_sfnt_off0001352d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1352D	19280 bytes
SHA-256: `692584acc16edcaf8b3eded281ecd30da2312d465092d7ac6e516fda20bb244f`
`font_02_sfnt_off000167d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x167D3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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