PDF malware analysis — malicious · 17e7971325987a86

MALICIOUS

PDF

78.5 KB Created: 2021-10-06 02:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: ea4bf2a55e3b2a5765b448377f7275d9 SHA-1: f3fd782d6e751f239faee61ac18b88f57faf5a74 SHA-256: 17e7971325987a8633dbb938c18c2b1f81b74597245ae2ca5a8c158ce2e8745d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://thaoduoconline.com/userfiles/image/file/78943337763.pdf In PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5d5c2d90815e5e7effc5d5dfb4c2cd87/renugagoziwumaxamopovubi.pdfIn PDF document text
- http://lnaixi.com/userfiles/file/20210929102231_1582280941.pdfIn PDF document text
- http://mtkshop.com/images/uploads/file/xujeperume.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156204897444---97470390195.pdfIn PDF document text
- http://grimastone.ru/files/61989047480.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d6beef18---11797829098.pdfIn PDF document text
- http://albertf.madteam.net/ckfinder/userfiles/files/61941807735.pdfIn PDF document text
- https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/40104312489.pdfIn PDF document text
- https://izometal.net/mm/file/rezimug.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381d186ad07---sukajapomef.pdfIn PDF document text
- http://escuelasfutbol8.com/docs/files/1433755979.pdfIn PDF document text
- http://indemo.pl/Image/files/pirisojaxarazafumofi.pdfIn PDF document text
- http://dhleisure.com/ckupload/files/vojutezofarabafesebulo.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c9f838455c---76323677601.pdfIn PDF document text
- http://eminenceinc.com/userfiles/file/pivumorosejerekopi.pdfIn PDF document text
- http://sungwoneng.com/upfile_editor/2021/files/1449420549.pdfIn PDF document text
- http://gyermekhaz.hu/Content/site_images/files/92674288635.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6rqnukkh8cksk4o34h1h6gc45m/xatimoxamuleker.pdfIn PDF document text
- http://cp-1.ru/userfiles/files/ramifev.pdfIn PDF document text
- https://leavereview.com/customerinterview/ckfinder/userfiles/files/sepobevib.pdfIn PDF document text
- http://sadiqandsons.com/userfiles/files/nuboge.pdfIn PDF document text
- https://ecoverservice.be/gallery/file/zasevimotufugewoj.pdfIn PDF document text
- https://bahia-group.com/ckfinder/userfiles/files/pofegofabozi.pdfIn PDF document text
- http://1qjd.com/upload/files/2021-10-06-06-56-44-kJVq28aV.pdfIn PDF document text
- http://dobre-jaja.com/Upload/file/rupukoxipizevelajokoka.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=word+classes+in+englishPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b8a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8A8	10544 bytes
SHA-256: `74118a6938ccec15f1cd854f60feca9d1c2cc655c06f4c08febf7326c3ae0cac`
`font_01_sfnt_off0000d055.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD055	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e866.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE866	18272 bytes
SHA-256: `0cd6803eeb533fe3c6fa5a0584e41b4fed55100c19a890b2bcb8d040d8d055b5`
`font_03_sfnt_off00010589.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10589	15296 bytes
SHA-256: `43a03bab834817d3d28728407d5cd0d007b2d5244175e9f40cec9a97f37036b1`

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