PDF malware analysis — malicious · 711ce03272164e15

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 02:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 0173b6ed93ae4bfc1eb823ade343c613 SHA-1: 640ab0c380c1e1b9f18ac63446d17cc5b56b2568 SHA-256: 711ce03272164e155244ee280802563134f473ca1c5e7519a0871e221bf30719

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicative of a link farm. The embedded JavaScript stream and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. The primary goal appears to be user redirection through a deceptive link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/e5adgmb6oec1gp1ihpfef3n72n/fojogesesefejokuvogujur.pdf In PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/wobifexiduxomupek.pdfIn PDF document text
- http://mazurubezpieczenia.pl/zdjecia/fck/file/pibiwuwolorakew.pdfIn PDF document text
- https://barrier.exma.cl/ckfinder/userfiles/files/sevowugizukonatexoba.pdfIn PDF document text
- http://keralatravelpath.com/uploads/file/wonisoveripazire.pdfIn PDF document text
- http://hiredriver.com/uploads/assets/files/68014721440.pdfIn PDF document text
- https://webmenuplus.com/images/file/1404235043.pdfIn PDF document text
- http://motolargo.pl/userfiles/file/38487944661.pdfIn PDF document text
- http://gs-metals.com/filespath/files/20210926073159.pdfIn PDF document text
- https://olivier-daulte.com/ckfinder/userfiles/files/27115348170.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613791c1ef737---bumijixunudi.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/795b73180722d3dc58b0be9daedc363b/75114245431.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/vamewaxizalusovuxunevobif.pdfIn PDF document text
- http://fvv-hohenfelde.de/sites/default/files/files/kuvilevur.pdfIn PDF document text
- https://assignmentmart.com/ckfinder/userfiles/files/55315623134.pdfIn PDF document text
- http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/motozopinakadekuvep.pdfIn PDF document text
- http://hydrem.ru/images/file/renaviwaz.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd38e0a365---5234145862.pdfIn PDF document text
- https://lazdynumokykla.lt/userfiles/file/pegazor.pdfIn PDF document text
- https://footballsod.com/images/ck-uploads/files/34480240675.pdfIn PDF document text
- http://thuduchouse.vn/pics/file/69026319591.pdfIn PDF document text
- http://toyotarent.hk/FileData/ckfinder/files/20210901_8B5409A74ECFFAB9.pdfIn PDF document text
- http://sonsuadogo.org/Images_upload/files/15381195181.pdfIn PDF document text
- https://toyotaautobody.com/ckfinder/userfiles/files/xoreroze.pdfIn PDF document text
- https://hongmao.tw/uploads/files/202109171144455787.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+game+play+on+pcPDF 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_off0000b555.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB555	10688 bytes
SHA-256: `7981fd4984ffd98869a4a6193009885e3753a32ac216e243653825ae52a12513`
`font_01_sfnt_off0000cd92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD92	16068 bytes
SHA-256: `abd8ff1a7d143152fc182cd6092914b4d5032cd1317505d756439d333ed6bd72`
`font_02_sfnt_off0000f6c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6C1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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