PDF malware analysis — malicious · 1f35a9fbc3464feb

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 17:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: bbf14b68d6d989c99678feef99495723 SHA-1: 641137819c80750caa29388945c22e8d0250ae91 SHA-256: 1f35a9fbc3464feb8e334e1ec12d32a9b8806a5b3b8ff127787ef64be708e9b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on potentially compromised infrastructure strongly supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=hydronic+supply+near+me PDF link annotation
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16085338841eaa---35202860868.pdfIn PDF document text
- http://aurora-c.jp/files/files/27944314957.pdfIn PDF document text
- https://erdemlerkoleji.com/resimler/files/99579583925.pdfIn PDF document text
- https://85097781.com/upload/files/deduzufafejamozegamixo.pdfIn PDF document text
- https://krantiservice.com/ckfinder/userfiles/files/71388086803.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ff6415d1---tozalaza.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607822197f7c5---gonan.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1dbf2beaa---wojorujuv.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/174c26e59c0eb3bde7b805db48a09b2d/tujobubitoxalixenufagolin.pdfIn PDF document text
- http://arniestribu.com/campannas/file/72516330813.pdfIn PDF document text
- https://rpitrade.com/ckfinder/userfiles/files/20499315487.pdfIn PDF document text
- http://maslag.eu/userfiles/file/xaxok.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1664138c4a8e8657c854277f72afcfc9/92792457744.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c091d4d4bcd---jiwexebenovexobuz.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/jg3di4h5grv444qjm3nqm0lj91/jopopepaves.pdfIn PDF document text
- https://carcable-bg.com/uploads/pictures/files/bafumepabov.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e1403eaac---70927469830.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078660524126---46639586932.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcfb71250---zesunuposewidimejuw.pdfIn PDF document text
- http://pampa.be/uploads/userfiles/files/viwusupidovimewejanajo.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c01e4904---vagujolol.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a119852ee31---nekarovafuvekilibaloben.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ec59cc8a---papopuviwez.pdfIn PDF document text
- https://mattress-leader.com/media/linojenoz.pdfIn PDF document text
- http://bluecars.pl/userfiles/file/3263565208.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_off0000eaf0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAF0	10780 bytes
SHA-256: `8c93cf089d492dc33c6aa8a3b80a35db7ef46bb7a7f7e8f250000b2a6c3bc62a`
`font_01_sfnt_off000103ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103AE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011bc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BC0	17148 bytes
SHA-256: `6f410b637c5a6774d6d707d462d87ebc5d26608463af5d12c22dea7d85d6b824`

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