PDF malware analysis — malicious · d0c87a199e5e1621

MALICIOUS

PDF

99.1 KB Created: 2021-09-08 05:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 122be6f6dee18c3974f694388e335308 SHA-1: 1d47ef56f78ff7535a1754bd5ff692cd2574e563 SHA-256: d0c87a199e5e1621091bc2ee048710e28da9db3dfaa833438bff1e18cd9d82c0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the structure and heuristic firings point towards a malicious redirection campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9800

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 http://bumsnab.ru/uploads/files/93481113756.pdf In PDF document text
- https://aplusadvance.com/naver_editor/data/file/sizivufedevipa.pdfIn PDF document text
- https://semsaesp.com/ckfinder/userfiles/files/27992442492.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2833be61---nuteserozedunomebotijetuj.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1354564cfd---toxogepewipamosuwizis.pdfIn PDF document text
- http://dkmmotor.com/files/userfiles/file/bozefugotofobixopob.pdfIn PDF document text
- http://canhtoanland.com/upload/files/71648640909.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0aad73479c1f0eef1c50a5ed7f532b56/bejazo.pdfIn PDF document text
- https://quanghuydulich.vn/img_duhoc/files/72600294628.pdfIn PDF document text
- http://thaimassagemodel.com/ckfinder/userfiles/files/kagup.pdfIn PDF document text
- http://beijinghuojia.cn/userfiles/file/93878289854.pdfIn PDF document text
- http://pomodorolennep.de/gfx/userfiles/files/89106475463.pdfIn PDF document text
- https://unifor975.ca/userfiles/file/3661511710.pdfIn PDF document text
- http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/q20lj4dsikul15da77cmve7mk5/28959061512.pdfIn PDF document text
- http://art-ball.net/files/file/30606528497.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f7b6cab1---sofulagodisarezofozavuge.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d7ee076a---96945861649.pdfIn PDF document text
- http://www.museopizarra.com/ckfinder/userfiles/files/bixukifaxave.pdfIn PDF document text
- https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/3fa8a80ad938d012790cc3236f4e8cf4/burisewimovikoxutosodidu.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/97175041522.pdfIn PDF document text
- https://marathonroller.com/userfiles/files/bodajixozezanifekeku.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/33c79c5d11af5647d03308e96725ff37/piwot.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kc5halt3l6no2u63k1s3pil1e7/furabawisawevogemexif.pdfIn PDF document text
- https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1f93fa3d0104732a8ef9a67408080e31/24948217775.pdfIn PDF document text
- http://burchiellati.com/file_fck/file/zojirop.pdfIn PDF document text
- https://guapa2.com/admin/fck/file/madezujavoguno.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ethical+dilemma+in+research+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_off00012106.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12106	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00013918.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13918	17424 bytes
SHA-256: `69314cb5ea446376d381cbc07d3b5129ac5e507b75dc2bdca172fccd5fb6a93f`
`font_02_sfnt_off000166a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x166A1	10748 bytes
SHA-256: `86c6f6a5af74722e88ae5112814c03aa6a48ea15e6987ed870514af1286e075c`

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