PDF malware analysis — malicious · 0fa3a16ad38b5af7

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 02:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 634d33368f2b25056d8eb5bb2eb9625a SHA-1: 12cdea6159b7393264792d2966790749513208c1 SHA-256: 0fa3a16ad38b5af74b4eb4202ea9ef412158064cd843c34ee082252261975d79

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to host malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://inwebjor.ru/uplcv?utm_term=resignation+email+to+manager PDF link annotation
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f9d7eafc---26882943837.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a753d140---53161826866.pdfIn PDF document text
- http://malopolskiszlakwinny.pl/upload/File/21568861785.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4eeac586ec---wumugiza.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a59077ccc60abf2e74bd3b6117436a95/48714193625.pdfIn PDF document text
- http://irk-yoga.ru/upload/files/7559093016.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/72ae9f210536dbbabbcc370638094572/kativejezubojogaj.pdfIn PDF document text
- http://mayjack.com/upload/files/16448060568.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/73508b43c166915d67d3c76084b68e32/91500613761.pdfIn PDF document text
- http://wefocusdesign.com/upload/files/nanafepe.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0ef0b90648ca51a855c04e6661c178cd/23591863927.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92f7b73797---77421067915.pdfIn PDF document text
- http://www.deep2001.com/images/library/File/zevoliwugosimex.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d5a612b4a648d73cd590377bd94207c/1438540206.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8e1d9e725356a18ff38fce260973b3c4/32513722289.pdfIn PDF document text
- http://standardamulet.com/files/files/34502288217.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3992737ea873a08feb57a2e76061f4b2/98960034906.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/df48080280aa040104a9aba13f8fb639/mavebari.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ea953340---rizolopozarodol.pdfIn PDF document text
- http://amoy-art.com/Upload/file/28798657711.pdfIn PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aead3da7bb---27719714229.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/27940bb4f65e057883ff02ca0c5f6b4b/jedofeze.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_off0000edc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDC1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105D3	17164 bytes
SHA-256: `7e4c83e28a308db699992fef57d18dc203f291a0b07fae27098f6caa106b9bda`
`font_02_sfnt_off0001326e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1326E	10496 bytes
SHA-256: `f9624f4aa76fa886e472a70f09ecbf42ddc5a4edbec3fce38eb7052a7e4d5a9f`

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