PDF malware analysis — malicious · 33d4862a928c040c

MALICIOUS

PDF

95.0 KB Created: 2021-09-04 21:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 98d093b2b18fc2168a3208af961ee68a SHA-1: 991dfa25cef81a8154cb9ce0afe21745f8caf46b SHA-256: 33d4862a928c040c9b54c0ab1fbf32809edb5f297f394f91114c3ff661f8173c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://resonanceacteurs.nl/userfiles/file/18274633569.pdf In PDF document text
- http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386b9d20fb---fedufobidiwede.pdfIn PDF document text
- http://mwflower.com/upimagesfile///58638633841.pdfIn PDF document text
- http://hiroi-es.info/yamituki-n/uploads/files/nogudivodiridijamopokate.pdfIn PDF document text
- https://goez3.com/10005001208290177/ckfinder/userfiles/files/77769597404.pdfIn PDF document text
- http://limeitec.com/upfiles/editor/files/xanigilokuzos.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed29c6b46a7---duzurizimukiw.pdfIn PDF document text
- https://b2cexpressdemo.com/userfiles/file/92320747600.pdfIn PDF document text
- http://tele-video.ru/upload/files/17246888895.pdfIn PDF document text
- http://mp-journal.com/media/file/272183878.pdfIn PDF document text
- http://zxsolar.com/d/files/37277919049.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7fe885e9---runazigesotug.pdfIn PDF document text
- https://lixtech.com.tw/ckfinder/ckfiles/files/bokan.pdfIn PDF document text
- https://www.aukuras.org/ckfinder/userfiles/files/37139754872.pdfIn PDF document text
- http://risorsaterra.it/userfiles/files/zezomukivunazipi.pdfIn PDF document text
- https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/15349948393.pdfIn PDF document text
- http://lncxjzxxw.com/upload_fck/file/2021-6-8/20210608014646512831.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/giwojexajizogem.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1798d25ce4---vovanodojigasol.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/82184962458.pdfIn PDF document text
- https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a51fe78548705d96cb213ce16d707e33/46991691111.pdfIn PDF document text
- http://ankamet.com/userfiles/file/95617900331.pdfIn PDF document text
- https://service-panev.com/userfiles/9394548894.pdfIn PDF document text
- https://smartbrand.ro/mm/file/merorufixutisu.pdfIn PDF document text
- https://ecotranslation.ca/upload/editor/file/xelazoramesasipelo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nabeel+qureshi+seeking+allah+finding+jesus+pdfPDF 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_off000109a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109A3	19328 bytes
SHA-256: `9ccef0e73bf25f89c5d8b9230e652bd2ce7f8ca303094ca6f6bccb4ef9ad14ae`
`font_01_sfnt_off00013c3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C3D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00015454.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15454	11144 bytes
SHA-256: `e30403c322501f4fef3d6be2d31e51f795944e2992b8c76199a8b14813a2a417`

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