PDF malware analysis — malicious · 55dff3752afc7849

MALICIOUS

PDF

77.3 KB Created: 2021-08-03 04:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 4b7b4e3cb284d7b9098abc6d347babe5 SHA-1: e2cc1e43dba910e43c6946eb899abff1a678f8c8 SHA-256: 55dff3752afc78491d5e7de9a9587cabea1eb2c7e47ee1da08b1c02210aa1320

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution tool. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself is also noted as potentially compromised, further supporting its malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=research+methods+quantitative+and+qualitative+approaches+mugenda+pdf PDF link annotation
- https://photojet.net/userfiles/file/15533470715.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a7c161e9ffdba7b38b107172a95f3477/radidifowakasevusapek.pdfIn PDF document text
- https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/u60huf3mmhr390toshgbknj2b2/xenasovutoto.pdfIn PDF document text
- http://szpital-sulecin.pl/images/fckfiles/file/31901360223.pdfIn PDF document text
- http://daeryuhealthcare.com/ckupload/files/98260197672.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa4144641---fasonemaneriwod.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acc790ab5fa---48458408133.pdfIn PDF document text
- http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/mituvuwimogozoxolisuzip.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0b5df84f---lidagerir.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db1b5cbe9b8---46249493178.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff3302c6756---kobasowarewukobe.pdfIn PDF document text
- http://bjbtrh.com/files/pic/file/danak.pdfIn PDF document text
- https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/304a8079002ebea383572ff267586c93/40465662942.pdfIn PDF document text
- http://scamps.biz/userfiles/file/nijupepabo.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c1ba9067---bufogebataro.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caae3411c07---befagiwogabagazepevu.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c202057c0bd---1846101047.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c99f646a7---49449106956.pdfIn PDF document text
- https://ozmutludokum.com/userfiles/file/24283029440.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6262eb0f87---56191689132.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986b571403f---bovudivuliwenov.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949f5bb7c5e---zitunapi.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cngph9qokc3f0m37f9pjm6orv1/95431790550.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tp4pqsujoquq9q5c1tp9aiov49/48137968809.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_off0000caf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAF1	11424 bytes
SHA-256: `b1a406937930a49d0f92c40e4d2c10520beb56fb55c86c6ccff1c15cc85316cd`
`font_01_sfnt_off0000e541.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE541	16436 bytes
SHA-256: `a6d7a68a134f876a5b4e42fbd9d29015dd04a1afc3f96b059f1a81aca1ed8768`
`font_02_sfnt_off00010f73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F73	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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