PDF malware analysis — malicious · 3986121d4b48e80c

MALICIOUS

PDF

85.2 KB Created: 2021-06-25 15:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 17aba12dafc68a3eadc483bc04c058a5 SHA-1: eecc3759aef85f68d1d27037f404fe9adf106f14 SHA-256: 3986121d4b48e80c2cc3ea18acf496b37c4b04d87755cf43e568a52b95d32799

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially harmful content, consistent with phishing or malware distribution campaigns. No scripts were extracted, but the presence of numerous external links suggests an attempt to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=use+of+articles+in+english+pdf PDF link annotation
- http://mikomisushiwc.com/uploads/files/zaxituzawudivinobe.pdfIn PDF document text
- https://susta.vn/userfiles/file/nenapepagupibogotofisadek.pdfIn PDF document text
- http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/a32b2c4717767c5703f311bfd2f3bff6/86216848349.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/06c8859cbb49151b51ab49fe473718d3/vofefivelivukukivuset.pdfIn PDF document text
- http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/10775061546094ce384721f.pdfIn PDF document text
- http://aire-limpio.com/img/editor/file/lapowemopeponamogezafi.pdfIn PDF document text
- http://datev.hu/ckfinder/userfiles/files/82591821967.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607167ec7b5ce---10961532431.pdfIn PDF document text
- https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/05868df2bdb6149be81b35b89a479913/38045171511.pdfIn PDF document text
- http://yaeram.com/userData/board/file/24280819626.pdfIn PDF document text
- http://simonhoirup.dk/userfiles/file/28924572227.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c1d47d935d9aeb972fd80e51a04bbaa8/nijowijizizufotesa.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ulgmehombb9s55jtr9q31sj3o6/61711029921.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c510b1281bb---7437376200.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1842e3175---pitoxoravis.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_off0000e879.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE879	10908 bytes
SHA-256: `0a014f7688dacadc83053738f7888d42b7d41b4995702e72ba1556670ff0c59b`
`font_01_sfnt_off00010171.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10171	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011983.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11983	17360 bytes
SHA-256: `aac4869e2d65c6b881a521244d9733527301551efdc94b569955f05738e42c43`

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