PDF malware analysis — malicious · 3ec93ad4674a69f2

MALICIOUS

PDF

96.2 KB Created: 2021-09-20 00:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 61fd6e3df0d484bf464b6c88157729ae SHA-1: 131f8ee545e49da390559c5839c57bbe009c9449 SHA-256: 3ec93ad4674a69f2001dcf765df7da2a141330aa549842797a5243e2f40f5f86

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and link farm characteristics suggests the document's primary purpose is to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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 https://allytemp.ru/uplcv?utm_term=audio+recording+studio+near+me PDF link annotation
- https://edusfera.pl/upload/file/19491537050.pdfIn PDF document text
- https://chinese-wall.tw/upload/files/xisirawukuxinoxiw.pdfIn PDF document text
- http://yotlist.com/uniformkontakt/userfiles/image/files/3247522436.pdfIn PDF document text
- https://alstar.uz/images/shared/file/74069944986.pdfIn PDF document text
- http://live-lessons.net/lcj/web/uploads/assets/file/punokum.pdfIn PDF document text
- http://clinicaveterinariaalbese.eu/userfiles/files/54296694725.pdfIn PDF document text
- http://ccshecea.org/upload/files/zodejep.pdfIn PDF document text
- http://sungwoneng.com/upfile_editor/2021/files/fizawabu.pdfIn PDF document text
- http://thepducphat.com/upload/files/12799549010.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140802996091---xesajanirezulesavamo.pdfIn PDF document text
- https://beysukonaklari.com/ckfinder/userfiles/files/32432130816.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ede2111331fef9a14feb6d1792816d46/majisut.pdfIn PDF document text
- http://osayit.com/images/file/83123957056.pdfIn PDF document text
- http://szyoujin.com/UploadFile/file/20210916162303622.pdfIn PDF document text
- http://bjsixiang.com/jingkelun/userfiles/files/20210917011052.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fa9e1e39b67fb156fe1d8e28da80fb23/24994888927.pdfIn PDF document text
- https://pointvirgule.ca/upload/editor/file/23628384162.pdfIn PDF document text
- https://www.sudoku-cool.com/ckfinder/userfiles/files/10263150152.pdfIn PDF document text
- https://tattica.byespresso.com/app/webroot/files/upload/files/75546568857.pdfIn PDF document text
- http://domki-kopalino.pl/pliki/98623588370.pdfIn PDF document text
- https://lesura.net/userfiles/file/5821626688.pdfIn PDF document text
- http://toanlinh.vn/upload/files/dirubutabenagerur.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_off000111b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111B7	10748 bytes
SHA-256: `64e0ab16713ef68ae09f10b05b967108db48286ccee17ea323c9f4395608cfdf`
`font_01_sfnt_off00012a3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A3C	18696 bytes
SHA-256: `76a7843abf557a3e38197651d608be338c1db056a69495774bf12e968ef7ada7`
`font_02_sfnt_off00015aeb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15AEB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.