PDF malware analysis — malicious · 5c11b3cb2f812e81

MALICIOUS

PDF

79.6 KB Created: 2021-07-04 07:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f152ee3f63a52a966b62661b682e9fce SHA-1: a389ed7a5ef0be5134a00a398876ca50a42ccc24 SHA-256: 5c11b3cb2f812e81f10fd63bcc2543f243158b0b6df65abfbb6f496e0348e1c0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content or further stages of an attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 https://ketchas.ru/uplcv?utm_term=assemble+the+crew PDF link annotation
- https://perfecthospital.org/FCKeditor/file/36318964835.pdfIn PDF document text
- http://nesthomes.in/userfiles/file/rupewugez.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ae89c3277---86275171942.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6cf362b10---52215168605.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7f2d168b---39565759163.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fd5fa109a97db391052c1d710bf4fbd1/64314995995.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d6c6b8be0f7faa76113c48c40ebfa647/sadaso.pdfIn PDF document text
- http://app8itebarandgrill.com/admin/images/file/gikevuvamuzuzidodanowav.pdfIn PDF document text
- http://rolmech-strzelno.pl/Upload/file/19004697267.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3dd94d26eda839e8babdaa97058c77f2/givededa.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8d1303a9a---disiku.pdfIn PDF document text
- http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6a4e2301---24548164148.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vbn8cvunkvihbc6vk0j68l1918/50586807653.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a08c6079a7fc33fd00a9446442ca592b/vazeponobapedosizujesi.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097fef6d4f4f---20186960184.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ranlmgn7euavh0rmij50t9nhqo/suxezadojune.pdfIn PDF document text
- http://stalmont.eu/userfiles/file/53436807852.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/t6ndpgidj3t3i5s1sitavdttm3/74061806111.pdfIn PDF document text
- http://bartuceviri.com/userfiles/file/46664468069.pdfIn PDF document text
- https://jxloanchien.com/style/postimage/file/60440750488.pdfIn PDF document text
- https://motelandratecuci.ro/userfiles/file/mujowupivapames.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/74000b06926f2ef6be8637fca32f4dc0/jivif.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084319cb9c48---zexeropovaxenuleli.pdfIn PDF document text
- https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/71058df92ab52ce2ff79aef6cc8c3124/48219962756.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bb43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB43	7964 bytes
SHA-256: `908cbacabbad8c6c3b41e7199fa86c190e1120148e536e8e30f8e3189ca59d04`
`font_01_sfnt_off0000d5ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5EF	10224 bytes
SHA-256: `6c296bdf1271c01a51fed0ee719cacb16ac41a3ebdddd042da9ed98cdf2af2de`
`font_02_sfnt_off0000ecfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECFD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001050f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1050F	17188 bytes
SHA-256: `2df4c40c0b1226821effabc994268fce5e5fc7ba105ecccef5e879f7f2828341`

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