PDF malware analysis — malicious · bb2e0d06570d87fb

MALICIOUS

PDF

70.7 KB Created: 2021-09-23 18:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 24e8fe7c19d2d43a3e685fcaadc6f9ac SHA-1: 47ccd5dd48e074d647bf2e19446e5f919e0eb8c9 SHA-256: bb2e0d06570d87fba82216daf74e18a799cf88ee362f69cf3ac7fa760f096a4e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to obscure the true malicious destination or host phishing content. The presence of embedded JavaScript indicates an intent to execute code within the user's browser or PDF reader.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=what+is+ethical+clothing PDF link annotation
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c5710d39384bcbc0edcb5e46931a13a0/bifivosagulebozuzi.pdfIn PDF document text
- https://corpus.bg/files/fck/file/rekolizoruletusivifugip.pdfIn PDF document text
- http://jedzenie365.pl/ckfinder/userfiles/files/tozaviki.pdfIn PDF document text
- https://bwhe.in/ckfinder/userfiles/files/45256966162.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132788e8b4c1---zunodosexetixawebogon.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6b70acedd67ef298030cbc8ed75fbe4d/20193439165.pdfIn PDF document text
- https://taucaotoccatba.vn/images/news/files/60006685571.pdfIn PDF document text
- https://cargotavio.ru/files/file/musisi.pdfIn PDF document text
- https://giasidaily.com/uploads/userfiles/file/vitogifad.pdfIn PDF document text
- http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/zasadufufikosovopoxexo.pdfIn PDF document text
- http://halongbaycruises.org/upload/files/7335528631.pdfIn PDF document text
- http://prochem.vn/images/uploads/files/sogitokajamibijususumun.pdfIn PDF document text
- http://quesnelfoundation.ca/userfiles/file/48846555129.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138c141490e9---damunogubenam.pdfIn PDF document text
- https://eco-translation.ca/upload/editor/file/maxepegosasis.pdfIn PDF document text
- http://ilsungwarehouse.com/userData/ebizro_board/file/1586849724.pdfIn PDF document text
- http://samwha.com/upload/userfiles/file/67741204350.pdfIn PDF document text
- http://krzeptowski.pl/file/28718605976.pdfIn PDF document text
- http://cluboutletmoto.net/campannas/file/geresizakafotinaleve.pdfIn PDF document text
- https://syteq-pro.com/userfiles/file/mowig.pdfIn PDF document text
- https://globalybm.com/ckfinder/userfiles/files/1631375195.pdfIn PDF document text
- https://www.douggoodkin.com/admin/ckfinder/userfiles/files/muvupupasuzozoxewotebotov.pdfIn PDF document text
- https://ltes2.tw-goods.com/UserFiles/files/40200624591.pdfIn PDF document text
- https://taxfirma.com/userfiles/file/91243839779.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_off0000b6a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ceb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEB7	10404 bytes
SHA-256: `2ef7e12bc65a6145ae872e1d3efa86a5702770142af8e2c63c1dd8f315c517fe`
`font_02_sfnt_off0000e63e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE63E	15484 bytes
SHA-256: `1ecba15ff8c10f32ed21765c1268bbbc040e163c1e7dabe03c667633b077f4fd`

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