PDF malware analysis — malicious · 5ce1d00d5f3db093

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 09:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a66d3db72325f59aee5a5bc8f1de8c9f SHA-1: c3c942e3547a6373a153058ce132780748e1ab33 SHA-256: 5ce1d00d5f3db0937cb8ac1a45c82f642b2b7fae4cbb9a7ee7c3f20fe41af87d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed here, further supports the potential for malicious activity such as credential harvesting or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://guruamardaspublicschool.com/userfiles/files/18710810464.pdf In PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee23d21ee0---dotegelazojafowik.pdfIn PDF document text
- https://www.hkfew.org.hk/ckfinder/userfiles/files/wozufesagepefokabexepuzig.pdfIn PDF document text
- https://hatinhjobs.com/upload/files/23581413209.pdfIn PDF document text
- http://nanobubblevietnam.com/uploads/userfiles/file/13674389258.pdfIn PDF document text
- http://vsrru.ru/userfiles/file/23148499705.pdfIn PDF document text
- http://bluestandard.pl/ckfinder/userfiles/files/4036323391.pdfIn PDF document text
- http://gpmpoolandspa.com/ckfinder/userfiles/files/26389079572.pdfIn PDF document text
- https://everestart.com/images/stories/file/52772026761.pdfIn PDF document text
- http://dogalakustik.com/depo/sayfaresim/file/vujukuxujoniwegusasowita.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303d76a3f60---sapawupezaroba.pdfIn PDF document text
- http://jenan.com/ckfinder/userfiles/files/gadususixinawafivijozidef.pdfIn PDF document text
- https://ginecologmuresan.ro/ckfinder/userfiles/files/21455799958.pdfIn PDF document text
- http://modra-skola.cz/userfiles/file/38978884545.pdfIn PDF document text
- https://cochleartudaskozpont.hu/files/lamegozisa.pdfIn PDF document text
- https://vishalahospitality.com/ckfinder/userfiles/files/26375481612.pdfIn PDF document text
- https://editionsitaliques.com/userfiles/file/81079462468.pdfIn PDF document text
- http://smalternatywa.pl/media/upload/files/ffbb2c5ec3aa07be3613717b1a2185a3.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ore3jefc6837b2780juutosgpg/51624734927.pdfIn PDF document text
- https://ltssinternational.com/res/wysiwyg/file/gutarume.pdfIn PDF document text
- https://www.disbel.es/ckfinder/userfiles/files/jukeladez.pdfIn PDF document text
- http://alsace.annuaire-regional.com/ckfinder/userfiles/files/lulimegebijesodonulek.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec45508a3---podesisutoza.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3bb01695d---nosevexovavigipu.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bb7c3175---binokurodogo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=va+va+en+devathaye+mp4+song+free+downloadPDF 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_off0000ce3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE3F	11164 bytes
SHA-256: `8537513c88c2268ffbb739645ad906628e975195197d291144ee8fae5bc97d2e`
`font_01_sfnt_off0000e80c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE80C	18888 bytes
SHA-256: `5e39e97903362dc8dcf7b1085a265c9906ad7b3587c8cd14c6e79a7265169482`
`font_02_sfnt_off000118a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118A7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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