PDF malware analysis — malicious · 4e0a1a3b0ab32d45

MALICIOUS

PDF

81.4 KB Created: 2021-06-25 16:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 2460e4a208617133d195785d173ef343 SHA-1: b69baa2b1984349f1fb96886645f49ea16c24bf3 SHA-256: 4e0a1a3b0ab32d4584867072b2f9f39b39161b998f25513f99de7ede877afff9

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct users to external, potentially malicious, content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/uplcv?utm_term=victoria+silvstedt+playmate+of+the+year PDF link annotation
- https://jnvhardoi.org/ckfinder/userfiles/files/sunugunevidowagod.pdfIn PDF document text
- http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82fd170c2a---54911282143.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806779e0a5d---74942678233.pdfIn PDF document text
- http://eros-arena.de/eros/userfiles/file/wujiroxifafemegirixegone.pdfIn PDF document text
- http://susutour.com/userfile/file/88729370163.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0cb4f18a52a9c03e2ff32ffa6a0d6014/50833979795.pdfIn PDF document text
- https://unicornccc.com/ckfinder/userfiles/files/janirewowedij.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091494466496---sikitonexisonapobito.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/gadimoxopiv.pdfIn PDF document text
- http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b22a6866---zeginevemopug.pdfIn PDF document text
- https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/86ce0c6d79e0601f616c5ce1fa96039a/wipoza.pdfIn PDF document text
- http://veterinariogiardinelli.it/userfiles/files/72031307827.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607868be5ae10---fitokepuvur.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f42f99eec---20748709860.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6093e873ef8205515fb0452a34ba103e/31940114632.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/294087bd63c8afa096b6f62ee95d252a/kuninubipu.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_off0000d6d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6D7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eee9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEE9	18632 bytes
SHA-256: `35648d35f6960f5c25eee74be68880618502c85eb9209a6eaf8be31aab74f178`
`font_02_sfnt_off00011f5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F5B	10928 bytes
SHA-256: `475f222b5aa0150012f4ce16fcecd5cab9f07fe49fc59f69f1488317a6a1067b`

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