PDF malware analysis — malicious · 96c970bf3d989e82

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 16:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 859ac3e90a664551b8a8988226dd4a20 SHA-1: 02f3d23eba904a07b36ee94438ae94f985571a30 SHA-256: 96c970bf3d989e821cde247d3b9e02f883f6d2db85d61777c8aa00f55fd23cfb

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to compromised CMS upload directories suggests the document is designed to host and distribute malicious files or redirect users to phishing sites. The primary attack pattern involves leveraging these links to host further stages of the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160851382acaf7---78605315275.pdf In PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a271a5b5ee---seraribonakidiku.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b457c569b35---21966069146.pdfIn PDF document text
- http://masan315.net/board/imagefile/file/tesuturapokipimaraloxaf.pdfIn PDF document text
- https://alamansyria.com/userfiles/file/ruwotopipabopaboligijonu.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/65532887458.pdfIn PDF document text
- http://world-spa-resorts.com/dok/rulozonoripizobub.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/97691ebfc8ee997ec35adbae9caa9017/77469420759.pdfIn PDF document text
- https://okna-kurska.ru/page_edit/_samples/userfiles/files/fomajuwiwalipozekez.pdfIn PDF document text
- http://dedanskecasinoer.dk/userfiles/file/11935444779.pdfIn PDF document text
- http://mindentudor.hu/userfiles/file/12205470465.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdfIn PDF document text
- http://maxtarget.by/ckfinder/userfiles/files/10878833857.pdfIn PDF document text
- https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/195219d68675dee337925d8d3ebe14f8/51293082091.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c016ffe2---rovoral.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af91aa767b6---78971500548.pdfIn PDF document text
- https://evpersoneli.net/ev-personeli/file/xonaliradop.pdfIn PDF document text
- http://sumosushingrill.com/uploads/files/1970548911.pdfIn PDF document text
- http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/fiziwiwazosokizaxaxixibul.pdfIn PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9ec27826a90d9f451c82bc78a7db424c/84778412307.pdfIn PDF document text
- https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/61472297623.pdfIn PDF document text
- https://mbamantra.com/ci/userfiles/files/1193834187.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9b7bb4177270dbcb6ea5a706459e4f11/soruzozebuxi.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3galn6kqb69h4g2aa90d3nc9b0/mudibapesixomemigolapuwe.pdfIn PDF document text
- http://lateonsettay-sachs.org/userfiles/file/4771578236.pdfIn PDF document text
- http://sungsam.net/userData/board/file/sitefepinu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fundamental+of+cognitive+neuroscience+pdfPDF 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_off0000deff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEFF	11108 bytes
SHA-256: `11f3b21e42e7906b5623969b193f0597b528de640906346e98b29e4c00f6a556`
`font_01_sfnt_off0000f8b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8B2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000110c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110C4	17216 bytes
SHA-256: `314b84c4ab46a15c0a96fe3c58f780ee97349271c3853002eb41d5419cd5e8b3`

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