PDF malware analysis — malicious · c36ef3e4237e5dd7

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 23:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 16c9688832af3606a94a5f5971f11af8 SHA-1: 559e8e76b8fb9ee1bd34f001f0caf325fa7b7b4c SHA-256: c36ef3e4237e5dd742fd374fd84ab2f92c64c4b86c55beab68a3586fa15ef581

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are likely compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farm characteristics strongly indicates a malicious intent to redirect users to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://renteci.com/imagens/file/39895507058.pdf In PDF document text
- https://pass-eco-energies.com/ckfinder/userfiles/files/25932800093.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/18034d101d4a40dd7f078126288d5863/zajinizebibuvuzunit.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/file/26906989419.pdfIn PDF document text
- https://autosaloncenter.com/uploads/files/29072514574.pdfIn PDF document text
- http://bearings-home.com/userfiles/file/66381264414.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/652f4f40de9c18aa17182370fbb85789/2511169949.pdfIn PDF document text
- http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teniwuwadoxepixeliko.pdfIn PDF document text
- http://ctkupavna.ru/upload/file/pateguzibepiwobizaza.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135189850908---wugirezeletitusoseme.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/43513445500.pdfIn PDF document text
- https://0286869143.com/editor_images/files/ferujexeluvev.pdfIn PDF document text
- https://magiccat.pro/ckfinder/userfiles/files/wutasiwulebubasalusal.pdfIn PDF document text
- http://druckmaschinenservice.com/uploads/fce/files/63402570073.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143605bc6bdf---wufotolow.pdfIn PDF document text
- https://holycrosshealthcare.com/userfiles/files/89452638786.pdfIn PDF document text
- https://kawanmto.com/contents/files/repatexejesesazenepar.pdfIn PDF document text
- https://eyescare.vn/app/webroot/upload/ckfinder/files/pesopapawoporodizalute.pdfIn PDF document text
- https://confeccionesruiz.cl/UserFiles/File/puzofanosezapo.pdfIn PDF document text
- https://lbjgold.in/ckfinder/userfiles/files/49173228624.pdfIn PDF document text
- https://cs168.tw/upfiles/editor/files/nanidekobuxodakavevaz.pdfIn PDF document text
- https://alsharqcc.com/userfiles/files/xuwufirekepuberovul.pdfIn PDF document text
- http://www.ezmoving.com/file/zubipafonowusodipil.pdfIn PDF document text
- http://brcassociati.com/userfiles/files/xikijebira.pdfIn PDF document text
- https://villatoscana-pi.it/userfiles/file/6898238806.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=app+download+history+androidPDF 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_off0000ba03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA03	16792 bytes
SHA-256: `25af690f60707db1dcd4b110203e8cd245bfee3d604394550cc3664c1c66e911`
`font_01_sfnt_off0000e4dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4DD	10540 bytes
SHA-256: `47bc2fe9a28202c157fc3ef90feed98555e812478bf973bf4cdffc977bbed813`
`font_02_sfnt_off0000fce1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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