PDF malware analysis — malicious · d41809f00870f483

MALICIOUS

PDF

90.5 KB Created: 2021-08-03 13:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 070725b8d56b9be1fdc446e9942207f8 SHA-1: fa4ff43f959dcd72b0a5e87790c0bb37a3735989 SHA-256: d41809f00870f483b360fef6902ab4e2e8fc9cbc7b7a451dcd8c070af6ca3984

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting. The primary URL, 'https://synerhu.ru/uplcv?utm_term=how+to+get+netflix+for+free+in+2020', suggests a lure related to obtaining free services, a common phishing tactic. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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 https://synerhu.ru/uplcv?utm_term=how+to+get+netflix+for+free+in+2020 PDF link annotation
- http://maternites-catholiques.org/ressource/site-image/files/47553684293.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a67b3d36383---buxagezadaterosi.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d49a2a19---83991118945.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d4be32641a1dd2b8f2f33fe308872e01/77886110321.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/928ce9a68aa1dd7daacb2e62068bcfd5/77339984087.pdfIn PDF document text
- http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfdcb40e8---zozepakiji.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3163d57429---3676898555.pdfIn PDF document text
- https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b4e096ad9efcb360680b8bc847f0cc15/36123921817.pdfIn PDF document text
- http://wijnhuis-vaessen.nl/site/data/ws/files/taran.pdfIn PDF document text
- http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/97v7umofj5sualrd3he90vo1uo/91198923701.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/36270756064.pdfIn PDF document text
- https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/an086tnak18oin431ks9q1f020/nididedavazujesepigolebuf.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2898d9875b---61338871009.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/cd481ec3cdf2a9637b5baccc51c32b59/427961554.pdfIn PDF document text
- https://elesud.it/img_pagine/file/72844279321.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d570a5cc22d---69047410031.pdfIn PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a531910a080444f11d828208f44ef15d/2103172013.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad469a2fa0a---51074470540.pdfIn PDF document text
- http://ohmamakitchen.com/uploads/files/mavebomugeruludakonemado.pdfIn PDF document text
- https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/24506347782.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f76dba6f---xikukujeluvukejamuweza.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c746c1825---vojaj.pdfIn PDF document text
- http://eraucheta.ru/uploads/file/wonewujigavuvinekisaki.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8a911aed---xovilefuf.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_off0000fdec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDEC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011603.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11603	10480 bytes
SHA-256: `8380e37d062e19f92da41c483d2e3112b06b4a5238f02f39548fe2c4fe43bb02`
`font_02_sfnt_off00012dfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DFC	17572 bytes
SHA-256: `ff45ed5209ac3400c4f0c06f34cfbd652f57f98ed7fa096b0490447841416a04`

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