PDF malware analysis — malicious · f387a3a25fc622fb

MALICIOUS

PDF

88.7 KB Created: 2021-08-23 17:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 2704ec478448ca8b0257b4e85c54967b SHA-1: e1bcd3bdecebd85e37a3f33509f76391398f0205 SHA-256: f387a3a25fc622fb3c1a8d95a96527df2a8b0f3e59e13415112186bb90445722

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous links suggest the PDF is designed to redirect users to potentially malicious websites, possibly for SEO spam or to host further stages of an attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=logitech+harmony+300+universal+remote+control+manual PDF link annotation
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/640d676ef40221612b5535796d483237/56939403161.pdfIn PDF document text
- https://dreamscapes.ca/dream_scapes/userfiles/files/21033646121.pdfIn PDF document text
- http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/gavubuzeduwuzigozefine.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/12b7b90acbf137b405aa4899acc70197/busoligimizakul.pdfIn PDF document text
- http://ty-int.com/files/files/kojevid.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/519bff48fa3bf3a30045d10d6c34b8da/10768873850.pdfIn PDF document text
- http://ifa-astrologie.de/userfiles/file/vekabuvoratigapupewaj.pdfIn PDF document text
- http://cmrivestimenti.com/userfiles/files/wepik.pdfIn PDF document text
- https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/90410343923.pdfIn PDF document text
- https://marblobaths.ph/app/webroot/img/files/93116024929.pdfIn PDF document text
- http://mayinluatudong.com/uploads/userfiles/file/webukotegex.pdfIn PDF document text
- http://hagelkonzept.de/userfiles/file/30549451638.pdfIn PDF document text
- http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac279f5f7---sodexewalet.pdfIn PDF document text
- http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/13848346925.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a72144bda3d---nikinavivukemaku.pdfIn PDF document text
- http://nbc.ua/design/pic/file/soxiretelub.pdfIn PDF document text
- https://www.lire-les-notes.com/ckfinder/userfiles/files/sifetute.pdfIn PDF document text
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c886f3531a7---44365554285.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e1ce58b3dc04ec2589f1251e5f37217e/40540241344.pdfIn PDF document text
- https://bouveau-consulting.com/userfiles/file/zexurotusimala.pdfIn PDF document text
- http://brandnewgoods.net/userfiles/file/makasixi.pdfIn PDF document text
- https://fnb-concepts.com/images/uploads/files/veloxenomitesugovolaguw.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c370aa4f203---37911653389.pdfIn PDF document text
- http://www.vegagastro.pl/upload/file/19592660494.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf665bae7---67208717691.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_off0000f091.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF091	19564 bytes
SHA-256: `7fa20deb675c2cdd02e3793721a2306b98b42772ea593c3e5b6698a2616bf4fb`
`font_01_sfnt_off00012252.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12252	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013a69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A69	11208 bytes
SHA-256: `f967c644a6b3a9eea5fe1debb446181a935d3277601f086eb2de24eb451e68b9`

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