PDF malware analysis — malicious · d8be514df8d526ed

MALICIOUS

PDF

100.0 KB Created: 2021-09-05 05:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e2c27f37dd9e615b9088e19dec0863c5 SHA-1: 5926cebd6043a0487cec1a6e73928e812c733068 SHA-256: d8be514df8d526ed94a528c5cc3f2b0fed2b20eec4af32115b700dcbc7436cfc

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://philabc.ru/uplcv?utm_term=manual+flash+canon+320ex PDF link annotation
- http://teplolux72.ru/upload/file/fopodi.pdfIn PDF document text
- http://umrllc.com/userfiles/files/87772340696.pdfIn PDF document text
- https://tecnibat.net/uploads/archivos/voboledomufig.pdfIn PDF document text
- https://svingenieria.cl/userfiles/file/tuvolitoxudikakukurese.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/563f9799979955ef54677a9abfeec094/91105162033.pdfIn PDF document text
- https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/34e2d943c1f62e9240a174d81039cb37/xamosanemakad.pdfIn PDF document text
- http://morgancountyoh.com/userimages/24347286151.pdfIn PDF document text
- http://meyras-tourisme.com/ressource/site-image/files/44226388743.pdfIn PDF document text
- http://dentalclinicbangalore.com/uploads/nivetivotomezoved.pdfIn PDF document text
- https://bettyloupaints.com/userfiles/files/zefulajapig.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b3bc56ddbb6456f4a36ea48dd401050f/fidowosewoketosedun.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04118c1df---97095502534.pdfIn PDF document text
- http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/debde60404dc76793a92abd9afb1ae01/59808174822.pdfIn PDF document text
- http://www.irrv.org/uploads/files/bunuvuvipug.pdfIn PDF document text
- http://metabolizmusonline.hu/images/upload/file/6172946724.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96bb50ff5---panudufaxolize.pdfIn PDF document text
- https://vico-domrep.com/ckfinder/userfiles/files/wegogeledarolimoxixipig.pdfIn PDF document text
- https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/87534604045.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941b73bc34e---kugeniti.pdfIn PDF document text
- http://pecsimutargygaleria.hu/files/file/wizupewugijasimijudiped.pdfIn PDF document text
- http://aven.su/userfiles/file/bopuvomuzeganozed.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8348116b6d9e078b60608a8e0f8a07f1/86883691996.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3bd09c91---runuvupo.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/aae5f0edd30dd93d06ec68ec75024614/25123435108.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fee9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEE9	10752 bytes
SHA-256: `210fc0748351c895b231397774aec2f4dce93b23175c7879fc93bd850a406723`
`font_01_sfnt_off000117b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117B9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012fcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FCB	23152 bytes
SHA-256: `4d01bdabe636584c1a73a39cdd810dd1bb21906b789cc5b747d654e4c83a520e`
`font_03_sfnt_off00016b44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16B44	16336 bytes
SHA-256: `4aa4ea582699fedbbdadc063f43bd1b4cbedb877506fb1ae283ad7d0e4518604`

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