PDF malware analysis — malicious · e556ff3d90b35c89

MALICIOUS

PDF

71.7 KB Created: 2021-09-23 02:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 802302efedd37495e8206dd9223a716b SHA-1: b9e2913725a7f2826ce8ab69a536beb97a9a5cda SHA-256: e556ff3d90b35c89f8c45d0d31308efd2aaeced58bb27b46e6ce9d85c797b911

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using disposable or compromised hosting for these links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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 http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5256bf8e0---jajosububitafoneputila.pdf In PDF document text
- https://cafesca.info/ckfinder/userfiles/files/tebojobezofabigejukolabi.pdfIn PDF document text
- https://cengilli.com/icerik_images/file/teluvivu.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161444a2383309---18165071521.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e78c2a6e7d6e693357dc88382fcc9c36/83832285783.pdfIn PDF document text
- http://www.vandiestbrandstoffen.be/uploads/files/96787647561.pdfIn PDF document text
- http://beachfirebrands.com/userfiles/file/85265094674.pdfIn PDF document text
- http://cephedanismani.com/images/pages/file/feruju.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b616a4c5fa61c52411166561d915b423/nebijubafodimezenekomipox.pdfIn PDF document text
- https://holocaustresearch.pl/nowy/photo/file/33430761299.pdfIn PDF document text
- https://festacontinua.it/public/file/pavegudinufexegapugava.pdfIn PDF document text
- http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8637216727.pdfIn PDF document text
- http://3q1p.com/upload/file/2109181311267321268liysmzi7t1u.pdfIn PDF document text
- https://zbmbudomont.pl/userfiles/file/29142725823.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4bfcb426aadd1752519308ac1f457138/derin.pdfIn PDF document text
- http://becskeicsodajo.hu/admin/fck_upload/file/wuridipotoxosi.pdfIn PDF document text
- https://amgaa.org/temp/files/fokajaruxinonerad.pdfIn PDF document text
- http://rintoyo.com/userfiles/file/53683247130.pdfIn PDF document text
- http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxeturudukirejexipudotot.pdfIn PDF document text
- http://wx-bm.cn/upload/ckimg/files/202109230701423374.pdfIn PDF document text
- http://thai-apsproducts.com/file_media/file_image/file/16636151606.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146fac71d8a9---kafegozirakujele.pdfIn PDF document text
- https://resttour.com/images/userfiles/files/6963278860.pdfIn PDF document text
- http://nissanotogovap.vn/uploads/images/files/72093047738.pdfIn PDF document text
- http://retailcop.ca/files/95480592630.pdfIn PDF document text
- http://vtdsbinhthuan.vn/public/uploads/userfiles/file/34492628084.pdfIn PDF document text
- http://clickvay.com/upload/files/jotawefukarivinede.pdfIn PDF document text
- http://remaining-mc.de/userfiles/file/3833115721.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=india+speed+post+internationalPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b96c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB96C	10336 bytes
SHA-256: `0c42e9d8084d9de0d762f7d37eedc27853967d9f5b7f56931db79d9b45c3f45c`
`font_01_sfnt_off0000d0c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0C9	15612 bytes
SHA-256: `487f8be15dd43b219366cf221c71910d34cdc2e953ad7a08e94cf43b548e4ce3`
`font_02_sfnt_off0000f88b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF88B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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