PDF malware analysis — malicious · d8f5be7630d64864

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 08:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: ab4e70527a5579ada4f735776d4c8150 SHA-1: 8f2de1cd9cb24e9404c93821cce2af5c4a731ea6 SHA-256: d8f5be7630d64864f4ec695a0e7c1b546a350b175f800f821b2e10e611b05b35

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a link farm used to distribute malicious content or facilitate phishing attacks. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/587m4mug01pm6fk4p9tauntsag/12965984341.pdf In PDF document text
- http://mobydick-band.de/fckdata/file/19269354560.pdfIn PDF document text
- https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/shds98ltcb7jkgiosdsoi4hbh0/54353910166.pdfIn PDF document text
- https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/251d78d6fd47ebb112de14b81c261704/86472794481.pdfIn PDF document text
- http://www.electricman.in/demo/frontend/web/uploads/files/30280081234.pdfIn PDF document text
- http://camionespanamericana.com/userfiles/file/80022657905.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tle7e9b5trrnhsjsnomk4psr2g/45175351917.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160997ef7a2e5d---gaxanuduxuworakofinefite.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9b71af8ab2a44bae3d1a83acf412d117/40908053881.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5e811b1d447fee4816af0f830af73651/tejofozarejanixagejo.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6529f8f613f69639ddd314c9fce2e7f7/lojatesujevor.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868c6c6c2ff---89259959858.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/fc46ece1ce9c2f1042f9608f37937b79/26036621271.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/95ca2d756989b4790fb835880e958a70/56568714847.pdfIn PDF document text
- http://lawngo.net/fckfiles/gefijeb.pdfIn PDF document text
- https://longhoang.vn/upload/files/zinixojene.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/xivotoregagas.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31cef2911---fuwigirosuwaximaxa.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ad3fc23ff38552bf6289ec102bc96b79/dixagamo.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c3365c4cd6d912bc2ebef04f00405a74/30555369901.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/52550055153.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c17839a0a1b---rasozalelagadotuxoz.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+outline+an+image+photoshopPDF 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_off0000ebb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBB9	10776 bytes
SHA-256: `ee694371a539ec245764b52a18d2ea793a1d0351cd4e1339feb1661bde4a116b`
`font_01_sfnt_off0001045a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1045A	16784 bytes
SHA-256: `c4439ad645470fef8d9d3f2dcc210e1a82f16bdf2486e029e387f552f60100cf`
`font_02_sfnt_off00012fe7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FE7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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