PDF malware analysis — malicious · d847110de8c75d61

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 12:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: e138cc408370d5ea8c231d7a56165894 SHA-1: b3dccdeaad247dc33b85d0078e9ba16fa672812d SHA-256: d847110de8c75d61bbecd39c4f430da1e517bf58fcffaa3d89bc4580a23e6287

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, embedding numerous URLs that point to potentially compromised websites or disposable hosting, likely to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and potentially track campaign effectiveness.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://trunglamdecor.com/uploads/userfiles/file/1820092650.pdf In PDF document text
- https://indobaliart.com/sitefiles/file/bebawemejiwenukilosale.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce1c832b60---kowesupogegi.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/00dee72e4275c96674a24a197d009a9c/9967939958.pdfIn PDF document text
- https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/6a86f58e7bf06d4ab5ba07753f85e135/24969436824.pdfIn PDF document text
- http://emrc.ie/upload/imagecontent/file/65430687667.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8342b57161---zutesirokabegoluz.pdfIn PDF document text
- http://bhk-aindling.de/userfiles/files/sewewepigozisepulonexixu.pdfIn PDF document text
- https://harrisitalia.it/uploads/file/48217454050.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea4371fdd---xadoguxe.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a66a3105a---bozivesuvugazib.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pi69ab5vc9ju9u08497v0e9pik/10344229359.pdfIn PDF document text
- http://hungbuloon.com/media/ftp/file/rojazepesedul.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b465fb0588b---sepidumalozewivub.pdfIn PDF document text
- https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/h8qjbm8m168m2op3rhujf7mi9e/dibowabige.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2745c6ab72ef04f622cc974975e0a6d8/bubegelo.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/473pbgbhrsb8safgs870c4d861/kirukomovadekis.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6c7f32aa827ef36b448bba7c5ca12c7f/92517620966.pdfIn PDF document text
- http://studiolauramoschini.it/userfiles/files/riwovuzojituj.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e00352031a9477e9c04109036429e35d/zokovejovukavena.pdfIn PDF document text
- http://chinahongji.com/d/files/kaxuz.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160857a2154e9a---85071369281.pdfIn PDF document text
- http://uci.ir/userfiles/file/wifilizafuluvopiv.pdfIn PDF document text
- http://cn-noah.com/uploadfile/file/lorejexiworiwab.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7565cf11b2---7469401894.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=news+article+template+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_off0000f550.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF550	17144 bytes
SHA-256: `089b056d0e0ff4b9651f4e0beb8e4c6ebfb4598379216d07151937714d825ac4`
`font_01_sfnt_off000121ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121EF	10620 bytes
SHA-256: `0aafc28a1b5d4e591e31e2d492b997cf5039e3ab7e43b9ee57bb06e48dd8cd30`
`font_02_sfnt_off00013a4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A4F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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