PDF malware analysis — malicious · 322f3aca89673ef2

MALICIOUS

PDF

83.0 KB Created: 2021-07-22 21:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 9a10d40cb05c687620334ffc43987e9e SHA-1: 871920532324191f1dcd1e4d02b7fccb2b163aa2 SHA-256: 322f3aca89673ef23feab7ee708809f1779daf1d549ed8ff5c8067de6ada61f8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://king-ber.com/UploadFiles/file/20210618011736280.pdf In PDF document text
- https://kompaspt2.com/contents//files/95470825211.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b036b836---jazad.pdfIn PDF document text
- https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/22fc07798389ab35dbcdf0ab48d73849/1174598645.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bef1463c0---31100774506.pdfIn PDF document text
- http://xn--vb0b83rba554gca.kr/page_data/file/20210713090119.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf6758c75---77245761361.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5e418b414a082b521b61ac0beda839a6/94779595702.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9cb50c1bfd00eccec8eb24e40aa1155a/retililated.pdfIn PDF document text
- http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210620194420.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160884933bd2b5---37465662642.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7de40109---nuxudujabogeg.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9msafe97ci9liof1mqkcq4s5g4/9616064727.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fafa7daf87---65387497384.pdfIn PDF document text
- https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8fe04d09a4b11bea6c6abdff4e6ebe64/lufixokelek.pdfIn PDF document text
- http://www.elstar.ru/uploads/files/9160150650.pdfIn PDF document text
- https://aspaeng.com/files/image/files/xubafivonolab.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b590da53d---nuxadatulibemejodugi.pdfIn PDF document text
- https://karinbentum.nl/uploads/file/2361016404.pdfIn PDF document text
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2fb5c6131bf006a90558b5a9eae97684/57621739178.pdfIn PDF document text
- http://fotofolliasanlazzaro.it/userfiles/files/jojozu.pdfIn PDF document text
- http://gdwtechnology.com/fckeditor/file/zenujotedokojefulil.pdfIn PDF document text
- http://szakkepzosiklos.hu/upload/file/pisid.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974121c7ada---dobew.pdfIn PDF document text
- https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/50779696b5db4766b423a44aaca3688a/sotorax.pdfIn PDF document text
- http://purofirstli.net/userfiles/file/68686544315.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+strongest+warrior+play+storePDF 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_off0000e173.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE173	16856 bytes
SHA-256: `f7c6c01aeb4df0cf20b1adf2bef1b18c157e89444b96f087ab25704d9913ef59`
`font_01_sfnt_off00010d16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D16	10768 bytes
SHA-256: `1ee5bbdafa3dbd0e8b54df08ff14c9e29aec9e95db8edfd2a099c5a1b53c9f0c`
`font_02_sfnt_off000125dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125DC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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