PDF malware analysis — malicious · 5d7e5bb90394bb06

MALICIOUS

PDF

90.1 KB Created: 2021-07-26 09:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: d1263355a24fd1a91f713ce990a2edc5 SHA-1: ff741b84bb04e831568f3e544cea0c1ec003dce2 SHA-256: 5d7e5bb90394bb0636f0f98401e0d6bdc04d0590b6bf4b9e07e2541f3abf3e4e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute traffic or host malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on potentially compromised infrastructure. No scripts were extracted, but the structure suggests a lure or redirection mechanism.

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://clickkedai.com/userfiles/file/sivovalilonajenesure.pdf In PDF document text
- http://acpiindia.com/userfiles/file/pojon.pdfIn PDF document text
- http://xedaptheduc.net/app/webroot/uploads/files/8961001170.pdfIn PDF document text
- http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2601eabec684c52eec21f377fd75b146/66691065670.pdfIn PDF document text
- https://golf-tout-terrain.com/publish/page/file/99332461271.pdfIn PDF document text
- http://teknis.it/userfiles/files/saxeles.pdfIn PDF document text
- https://parklanehotel.asia/userfiles/file/62010340699.pdfIn PDF document text
- https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/4fu9anm14eml02p38jtdr7oimi/nozozaxixudupu.pdfIn PDF document text
- http://blpest.com/UserFiles/file/72782898095.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/91d5aed7bb65bc55f731ee24fce45449/73953584572.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/946d8394ac0ff37a0a1425f5cb6ed11c/45610663541.pdfIn PDF document text
- http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/2641034657.pdfIn PDF document text
- http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd4d4dbe2---60007595031.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/187774c6582b1e6ed0cfc7df99a6f7b5/fotop.pdfIn PDF document text
- https://globalmediaminds.com/uploads/files/88577493288.pdfIn PDF document text
- https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c62709c729f852a970152fecf131db81/1247041376.pdfIn PDF document text
- http://cesishotel.lv/res/wysiwyg/file/33265567198.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f1216b90e---71978410270.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/wexadalajozavuw.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/88041631044.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23380016e2---81730194012.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8df1d72c9d3c6894642e9ad097f64a27/23815939724.pdfIn PDF document text
- http://vincitydata.com/uploads/ckfinder/files/40962699397.pdfIn PDF document text
- http://xinyuemu.net/assets/202106/files/20210608102127547752.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=los+pazos+de+ulloa+resumen+por+cap%C3%ADtulos+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_off0000fc64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC64	16792 bytes
SHA-256: `6f2533278118042fad17a6013044296fd36ad1cd2bb7cd9eca1c172a00b4f0dc`
`font_01_sfnt_off00012677.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12677	10868 bytes
SHA-256: `972eda4f0cc4793786a65f6aa47c99f128ea8dfdc91082440eb7c74ea63c6457`
`font_02_sfnt_off00013f9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F9E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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