PDF malware analysis — malicious · f86e74a350e5e104

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 03:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: da475e23225061a43549776e30e28d7a SHA-1: cb7fa6b72ef3b6f66fb1c1c533cef9359af3a05a SHA-256: f86e74a350e5e10443eb579d43be484139d4cba0d8c8f8fde95308296d8dfa16

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

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 http://vytvarnyobchod.cz/UserFiles/File/23739266073.pdf In PDF document text
- https://gizaviation.com/uploads/files/39255225202.pdfIn PDF document text
- http://xedaptap.net/userfiles/file/10210187598.pdfIn PDF document text
- https://almondzwealth.com/administrator/imagetemp/file/3471062603.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e926fd2f---woruzovas.pdfIn PDF document text
- https://thediamangroup.com/_images/files/xugepegaxalugijumutudagef.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099919341bb8---pivebofanoduwebu.pdfIn PDF document text
- http://lookkorea.net/userfiles/file/12197986191.pdfIn PDF document text
- http://czdashan.cn/uploadfile/file/2021050704535773499.pdfIn PDF document text
- http://yogo110.com/userfiles/file/guzawo.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092cdf3eca4e---33376726637.pdfIn PDF document text
- http://sattamatkapatti.com/userfiles/file/magitotupukem.pdfIn PDF document text
- http://vaynhe.com/upload/files/82912136390.pdfIn PDF document text
- http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/boxefa.pdfIn PDF document text
- http://ceskylakros.cz/userfiles/file/gipukepezijevibamexito.pdfIn PDF document text
- http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08ad5088b---51317997491.pdfIn PDF document text
- http://villalapinetafavignana.it/userfiles/files/74628273288.pdfIn PDF document text
- http://metallpress.ru/files/zagunatuguzerokolopa.pdfIn PDF document text
- https://zzhqhi.com/d/files/motesagaxiwitewitugupize.pdfIn PDF document text
- https://eventspicer.com/ckfinder/userfiles/files/zonobaf.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161145b8ed2824---kobalomilupur.pdfIn PDF document text
- https://newline-eg.com/userfiles/file/gazonuso.pdfIn PDF document text
- https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/814d4fd8f861b7d26f68c933dcf7552f/gererimavogotavabuwupudes.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fd00b99c0980119e7ec02ea7092786a6/65637740669.pdfIn PDF document text
- https://jaurrieta.net/USERFILES_JAURRIETA/files/dobupixajo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=words+that+start+with+f+positivePDF 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_off0000f628.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF628	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010e3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E3F	10592 bytes
SHA-256: `ff58f34093a9041785e9a28c3009ee5a2facf23728dee1c4733e9b6dc9965284`
`font_02_sfnt_off000126a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126A2	18364 bytes
SHA-256: `48483c98f62298eee6df693752bdb7a167f0dccfe90e5bab42217c580af2989e`

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