PDF malware analysis — malicious · a54b06328770ad41

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 10:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c4f190fa9caaeaf60b4c59e05753652b SHA-1: 9b3d9f184e650bc564b58f33c0277d77b43fd730 SHA-256: a54b06328770ad416e1f989cd8b73cf2ffac9228811443bf68fc5d6b6917f11f

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to host further malicious content or phishing pages.

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 http://studiosantomauro.it/userfiles/files/nugaraja.pdf In PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d67b2dcf7e9ba6afead0eb88f709ea47/9643613280.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16120fb9b6675d---kobide.pdfIn PDF document text
- https://carparts-fixture.com/file/file/kowopozegeleso.pdfIn PDF document text
- http://grafichesirio.com/userfiles/files/50799766452.pdfIn PDF document text
- http://gancza.pl/userfiles/file/78707379963.pdfIn PDF document text
- http://spamsmsgiare.com/media/ftp/file/vonivozitorawowadar.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/20890fbfd55b554dd60cff146de8c9be/20610918754.pdfIn PDF document text
- https://jjcfurnituremaker.com/userfiles/files/nokadejutuwawizusu.pdfIn PDF document text
- http://packamate.com/userfiles/51983134280.pdfIn PDF document text
- https://widepolymers.com/userfiles/file/dazomepudetuwek.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6dcd6246253f17a2a4bf893f242045d7/27804558330.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ad65927320ee47b8d4746d55a1672e9a/wunikojobesagiwon.pdfIn PDF document text
- https://ecotranslation.ca/upload/editor/file/72906747948.pdfIn PDF document text
- http://ty-universe.com/image/files/20210816_104320.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fd808cbe75e2b3e8e4fb989082b7140/24813696576.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1611e09f56d705---90926505047.pdfIn PDF document text
- http://emrc.ie/upload/imagecontent/file/voxel.pdfIn PDF document text
- https://alshamiltrading.com/alshamilfiles/file/53513421289.pdfIn PDF document text
- http://yavuzselimvakfi.org/resimler/site/files/27448433747.pdfIn PDF document text
- http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/terizolonudigekud.pdfIn PDF document text
- http://nkmate.com/FileData/ckfinder/files/20210904_E1BC608C946CA56F.pdfIn PDF document text
- http://apexhealthnutrition.com/newerac2c/userfiles/file/gonixaguda.pdfIn PDF document text
- http://garage-ys.info/js/upload/files/30141355864.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o192nm8kaus3dijaa9ih96pocf/maxuzopomimaz.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/418ac6360d8883cdf7567f2785b5a40d/14162144473.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vespa+300+gts+2018+manualPDF 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_off0000c8dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8DD	11028 bytes
SHA-256: `93cd88c2cb4b9e83a0d4f495b925622271180edf6fb530e3cde7ada80c4d5068`
`font_01_sfnt_off0000e2ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2AB	17592 bytes
SHA-256: `4548b11dc41e8eb1c5d4fac8fd333929ee12ea8bdeed8d1a92407553258d3452`
`font_02_sfnt_off00011046.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11046	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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