PDF malware analysis — malicious · e83fded8c4f4ae5e

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 06:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: f1ff03f5bdf5c3f5c8983ff937bcc358 SHA-1: cafde6fc8f0b422f163b8c0e32cd6032836dfb29 SHA-256: e83fded8c4f4ae5e102e29eac5412e45efd44b62913a595f31fd81f71dcc1212

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage redirection scheme designed to obscure the ultimate malicious destination. The ML classifier strongly indicates malicious intent, and the presence of numerous links on potentially compromised infrastructure supports a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611291dd81d86---97025112394.pdf In PDF document text
- http://jyjwqj.com/uploadfile/file///2021061407582324.pdfIn PDF document text
- http://ellev.fr/upload/files/putokidurub.pdfIn PDF document text
- http://eros-arena-reutlingen.de/eros/userfiles/file/54582167647.pdfIn PDF document text
- http://wintec-samu.hu/uploads/files/54440966672.pdfIn PDF document text
- https://best-of-geldanlagen.de/userfiles/file/rowonerafasalira.pdfIn PDF document text
- https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c74c71f01e9---surutukemutizelix.pdfIn PDF document text
- https://cmfnepal.org/userfiles/files/xikoxojakosuvanu.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/11043b23a217bd620e400fac95a13594/gagawarixex.pdfIn PDF document text
- https://jokerprod.net/userfiles/file/godawanodi.pdfIn PDF document text
- http://elementsgogreen.com/userfiles/file/87319933303.pdfIn PDF document text
- http://omgmediatank.com/userfiles/files/gajuvumepoxubemeg.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/a1h0n157cggmvm4ilbghmtof09/wolotekorumex.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/jvklqs5p5hgml205p085i1nr4l/42583696114.pdfIn PDF document text
- https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/53opd26umqmi9cbll6ji51brs9/nubugemasavukijut.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160807313a25e7---85008717956.pdfIn PDF document text
- https://iwanbim.com/userfiles/files/31098493987.pdfIn PDF document text
- https://divinenine.net/userfiles/file/92009150920.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=transmission+model+of+communication+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_off0000e329.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE329	10844 bytes
SHA-256: `f674070e2e5d7bb5fef8f231384a93f593b1c0aa09f223f3403f5aba75818a46`
`font_01_sfnt_off0000fc27.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC27	17408 bytes
SHA-256: `78c41a72e99efc7b39f87363a4d708108540c7ace29dc7b885dc885254901afc`
`font_02_sfnt_off000128fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128FA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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