PDF malware analysis — malicious · 5510e7f8b7210672

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 21:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: ecc20709ff9f1e14ec590c30ffd6b8b5 SHA-1: dbff72debac791941177ac254ab3fee4186ccc8f SHA-256: 5510e7f8b721067205f716abc6e0fb11842b5de126b82bbfb8d3107fd7476150

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to external resources, including those hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content through a deceptive link structure.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://twinslock.com/ckfinder/userfiles/files/dirutunutowofowi.pdf In PDF document text
- https://farmacieitaliane.com/documenti/file/kededatolapolirufoti.pdfIn PDF document text
- http://rexant.by/upload/editor/files/34138699490.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/g2n5jq9kfvg54398qvr9vsvb7v/38604335226.pdfIn PDF document text
- http://dakmoto.cz/obrazky/file/bipebatewopu.pdfIn PDF document text
- http://narcisse.sk/editor_uploads/files/xisisofigexiwinexovebomez.pdfIn PDF document text
- http://hf1968.com/clients/48820/File/zuzalaxefegudezif.pdfIn PDF document text
- https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c469adbfdf03a8aea45db1109858e4b4/fowisawabutapulobaze.pdfIn PDF document text
- https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/7f099d7030f159966e2212814f7c6bc8/zaverepibujabetadasezeje.pdfIn PDF document text
- https://loctra.net/userfiles/file/vevumujejejawulumipep.pdfIn PDF document text
- https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/038bf55c15e2cf6cfadfbdf8926a3230/20653033578.pdfIn PDF document text
- http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/bumuvokowoj.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16126a72b7f1b0---bavotera.pdfIn PDF document text
- http://mnogonomerov.ru/uploads/file/17607291009.pdfIn PDF document text
- http://screen.by/images/file/37961457809.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d9ae2f1e63007990a0ddd33b269d3684/perajebavelunesi.pdfIn PDF document text
- https://aftaplan.com/works/peepsparty/html/upload_files/file/83093939913.pdfIn PDF document text
- http://paliukenas.lt/i/File/2822123716.pdfIn PDF document text
- https://paroles-vives.com/ckfinder/userfiles/files/pisosudun.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f61c5f2385fb9aee5725f2a4f8e07458/86897179419.pdfIn PDF document text
- http://phanphoiongnhuahoasen.vn/upload/files/8373707444.pdfIn PDF document text
- http://pspectr.ru/userfiles/file/5203566674.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6142b67ea1---27233186813.pdfIn PDF document text
- http://homeopathyhongkong.org/files/jaweferup.pdfIn PDF document text
- https://clifestyle.net/uploades/userfiles/file/48809261502.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161131ee1f077d---12122995304.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=information+systems+research+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_off0000e284.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE284	18696 bytes
SHA-256: `311a261211ae862a5404fa9e45260a8b4496ebd59046647b3c8f0ae6546debe9`
`font_01_sfnt_off00011358.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11358	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012b6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B6F	10904 bytes
SHA-256: `1c45170b4b7310876368ffef82521c0a5bf75d36d17831cc4c22cf04a36aceef`

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