PDF malware analysis — malicious · a12246539dbadb70

MALICIOUS

PDF

91.9 KB Created: 2021-07-08 11:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d703e43e22a3145ee5cae3d26de80bcb SHA-1: 596a9b2e9411e329fb35fb36708d19fafab36f80 SHA-256: a12246539dbadb70723a3d1313ef891dff3de2d699026809ba259ee8e7db9979

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to direct users to potentially harmful external sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://oniceh.ru/uplcv?utm_term=deo+vindice+latin+meaning PDF link annotation
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/9c713c7017341e5ec4881c90a45ddd15/97977256821.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/21449829773.pdfIn PDF document text
- https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/e2a8027016317a4c9d568ae7038a4cbb/15225137771.pdfIn PDF document text
- http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/801kgfh1n1qq27r6523upj9q6v/pamufanexexebekuk.pdfIn PDF document text
- https://heatingboiler.ca/fck_upload/file/86718780054.pdfIn PDF document text
- https://noihoithanhtuan.com/media/ftp/file/99879214725.pdfIn PDF document text
- https://groupburuemas1.com/contents//files/zefudotumogipepojixe.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1a6e29d390c1c146413903e35b2f71b6/10307701303.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8472113c779aa0952dddc7bbf260e2d3/makidawipajawonafowulojer.pdfIn PDF document text
- http://www.anclupnapoli.it/userfiles/file/10445038802.pdfIn PDF document text
- https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/588015f17290c04b7df73b7172232b95/92838356365.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/rifelaxopixesagepurezuvol.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dq36jlh9p7mencr06n7k66all/silubavefijanasemeti.pdfIn PDF document text
- https://alshamiltrading.com/alshamilfiles/file/53370186963.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c62f384c9---jonevuroxusovamofawezenog.pdfIn PDF document text
- http://learnazia.com/fck/imagesfile/giroforejavixerorubelak.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609145ae7a2c5---33254130676.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d701c637244204905f0b36ef90cc31ef/bolebo.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfffde44f5---papudoterixerodomonubu.pdfIn PDF document text
- http://degrossier.nl/uploads/file/bejip.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4cr4fnpc79qi674n1ep4689ud6/56484766787.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b74d125ec---polojubojemutetamosaw.pdfIn PDF document text
- https://clubslotalmatriche.com/calcas/file/kavologejodid.pdfIn PDF document text
- http://dlt-nkp.com/fileupload//file/18313759205.pdfIn PDF document text
- https://drvishweshwari.in/userfiles/file/18019098242.pdfIn PDF document text
- http://china-hold.com/UploadFile/file/20210527222442265.pdfIn PDF document text
- http://j-line.ca/fck_upload/file/2566567950.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_off0000fe68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE68	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001167f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1167F	10512 bytes
SHA-256: `24de43403c9d9ed367a84ff2587d09a82c010801ed511f4bc8e2c562ff2d3eab`
`font_02_sfnt_off00012e2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E2B	19268 bytes
SHA-256: `5d859fb59d4e27b92515da85554ed231a9a34df2a8a1ae3aa8e58d413863500f`

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