PDF malware analysis — malicious · 85d1e2ad80d010d3

MALICIOUS

PDF

107.5 KB Created: 2021-09-04 19:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 24aa555480cb7674d212995a81e43924 SHA-1: f242f9fff6c3b1e0a8a68b3ac68a2cf0af94697f SHA-256: 85d1e2ad80d010d3a9fb99d2ab6f42b46cdd445efb8cbde9d9af55025f3316ba

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to malicious websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=arabic+to+bangla+dictionary+pdf PDF link annotation
- http://softtox.com/new/userfiles/file/wipakowuniterawemem.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6442211c87---tolonitexuru.pdfIn PDF document text
- https://jjpremiers.com/files/23854934987.pdfIn PDF document text
- http://eco-building.cz/UserFiles/File/virara.pdfIn PDF document text
- http://ykzn8.com/upfiles/editor/files/27694167584.pdfIn PDF document text
- https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5da5c623a---zapexisuregavowolokawowiw.pdfIn PDF document text
- https://amatnieks.com/pictures/image/5955306676.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/e4djhqcatuoj70rgoi4vkdl704/zesatepopetategugexunofe.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a615a6656e4---xonekobofidokibu.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67dac531e---89190673962.pdfIn PDF document text
- https://tekstilkentrehber.com/upload/ckfinder/files/97240993115.pdfIn PDF document text
- https://baxsporthorses.com/userfiles/file/timofofonepuwuruw.pdfIn PDF document text
- https://hanyauntuktesting.com/contents//files/wufekixunar.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e65ad4d5---purovu.pdfIn PDF document text
- https://bio-obst-und-gemuese.de/userfiles/file/95109511584.pdfIn PDF document text
- https://meccanicagambirasio.it/file/dasat.pdfIn PDF document text
- https://naveenent.com/administrator/imagetemp/file/bibatonisoj.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fe1091df22e20d81f40702e82a9252c6/pifufejimero.pdfIn PDF document text
- http://growlink.biz/userfiles/file/84520334871.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b7bc1c866b434bc509654ee47b1e0b5f/gegekejupevezanizaluk.pdfIn PDF document text
- https://nhatngudongkinh.com/upload/ckupload/files/27163164744.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ab358468270d4d8828ada205330610fe/70265291126.pdfIn PDF document text
- http://dgjst.com/upfile/file/19226517570.pdfIn PDF document text
- http://minhvuongthuphap.com/upload/ck/files/43191442364.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_off00013000.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13000	10728 bytes
SHA-256: `f08f7ede600953d6d363cf3d6d1aa5bc3bb0056b2dff61785247c6e994b56b8f`
`font_01_sfnt_off00014859.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14859	24456 bytes
SHA-256: `093e0c6362d5d517157c7a9a8ad9abe2100d4e9cc4073fa6f0b0fcfd01fb1b99`
`font_02_sfnt_off00018817.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18817	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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