PDF malware analysis — malicious · 378fcfc8ef1b4f22

MALICIOUS

PDF

91.3 KB Created: 2021-08-21 06:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 47c317b76d92b5493f18a083677a180f SHA-1: b9b7aaba9ffc51c78ea71b1fa847710141a33b98 SHA-256: 378fcfc8ef1b4f22fbe9208d17440f0c861cbb64d05beeaa38d9c0d049a6ebc7

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or to host further malicious content. The presence of embedded JavaScript indicates potential for client-side exploitation or redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nr2c9qg3qonc98qsblh8dbg364/konevavotedi.pdf In PDF document text
- http://ydis.kr/userfiles/file/230559171718.pdfIn PDF document text
- https://wintechindia.in/ckfinder/userfiles/files/kisib.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d08989a54fce10deca0baf9c3899e796/kerorijarebidawaxibosido.pdfIn PDF document text
- https://fotobolfestmeny.hu/mvc/userfiles/file/23098467927.pdfIn PDF document text
- https://nadinerogger.ch/userfiles/files/dawizizegilen.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec61fa89e5---danekasun.pdfIn PDF document text
- https://semagro-msw.ru/pics/images/file/zinuwuxetadiwofafizepij.pdfIn PDF document text
- https://comtraining.cl/userfiles/files/89903613120.pdfIn PDF document text
- http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/77226932339.pdfIn PDF document text
- https://x-leather.com/radsportfiles/file/57773231323.pdfIn PDF document text
- https://kurtwohndesign.ch/userfiles/files/43769592735.pdfIn PDF document text
- http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b95acc0096b---12421936569.pdfIn PDF document text
- http://handbook.hu/upload/page/file/21089012096.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e6af1b23f116406d9974e22acd81f648/xajorujiraje.pdfIn PDF document text
- http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/53354850050.pdfIn PDF document text
- https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ikhmaa7dfq6ti5jh4kkavpl50g/xifap.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5vqv5brlaeb0nk4dhcii83p7n7/10742843723.pdfIn PDF document text
- http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/56690889993.pdfIn PDF document text
- http://obrienbuilders.com/userfiles/file/89340802967.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d900702fa---bozosunupodadowa.pdfIn PDF document text
- http://nordicwalkingturak.hu/_user/file/48832248973.pdfIn PDF document text
- http://dokturmice.com/ckfinder/userfiles/files/sebalirikolo.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/73c21ceed9e832d44c11b41ca605e3fc/72844063071.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pronombres+posesivos+en+italiano+y+espa%C3%B1olPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e2e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2E7	17280 bytes
SHA-256: `62680a6a69dc6b10bbd7fa2bf2f8065a7818d1c7772eba104efb5c375221c075`
`font_01_sfnt_off0000fcf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCF9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001150b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1150B	18124 bytes
SHA-256: `3a82d65caf50fdb65248801217e8223321e61a73e62275cb5543dc706dc429e3`
`font_03_sfnt_off000142ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142EC	10940 bytes
SHA-256: `50b3b327f39add3f3096de18d7c5c09f15fdb7aa80be2a4613acb96082da7b3a`

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