PDF malware analysis — malicious · fe115e93135ae32c

MALICIOUS

PDF

84.4 KB Created: 2021-07-04 23:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 68448d9ebe5472724da4b1520f168666 SHA-1: 7f7b38653a7b5f37f2a007c2978c49511fe215b2 SHA-256: fe115e93135ae32c97b9a25d6c3cded10499640727e0e626eb8a302cce42a715

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple distinct hosts and a high number of links per host indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/31vm394o5pq4j4pugrj8ani5et/wesobavisigose.pdf In PDF document text
- http://stasta.com/userfiles/file/42280982236.pdfIn PDF document text
- http://tecsun-moscow.ru/docs/file/57683585171.pdfIn PDF document text
- https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/61693a7e7d77344094ea9488df56e235/65803808446.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62c3dde2---63846095422.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5067a36759c67919421378e23562f344/donujevaliguvutisiledari.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098984eb0a9f---2219068272.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c36ea03af---50925438485.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ao0r90rf2fg9j4g5bpo20pl441/15311029981.pdfIn PDF document text
- http://bobas24.pl/Upload/file/kadoxitaxizotepaxedak.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736c2dc96b9---30562910172.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/a2al0836mduh2l0o7vfeae36mi/fabumijoxofuruwijodix.pdfIn PDF document text
- http://rudolphi.nu/userfiles/file/nimodipatirak.pdfIn PDF document text
- https://branchennachweis.eu/userfiles/file/47682553688.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2823c3ebf5c209bfcc351869c3261c7c/zofaba.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51776bb8b6---85061541731.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ee74e343a---fetimusevupubebel.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d17c9c7afc88f06da312781499960a3d/75502167393.pdfIn PDF document text
- https://hansenlight.com/UploadFile/files/xozilemazekuxa.pdfIn PDF document text
- http://anma.pl/anma_edytor/file/5286884162.pdfIn PDF document text
- http://kanchanaspa.com/ckfinder/userfiles/files/lutifep.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1905d6da---84595872245.pdfIn PDF document text
- http://dulichtantai.com/files/uploaded/files/25937947.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef995599f---tokugaxasorolowawoki.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42ef5d613---kolosajinef.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=birthday+wishes+to+teacher+in+tamilPDF 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_off0000e833.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE833	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001004a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1004A	10888 bytes
SHA-256: `83ea91a5b0caf434a7ca125da9785d8baffa850e9c0a62434700b025eaf9febc`
`font_02_sfnt_off00011956.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11956	16636 bytes
SHA-256: `c9012b728bd68e41b90a2847085852bd91034756484dd2dd8dc97c515e6232fb`

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