PDF malware analysis — malicious · f689887c4a5833b2

MALICIOUS

PDF

79.3 KB Created: 2021-07-23 03:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 5e3d60426c60c4994dc4220671e565b4 SHA-1: 648014e335d95f21f78443b663ac7ed7019f23c2 SHA-256: f689887c4a5833b232f4be029e1cd030a3af205c897b5e038bf0b6a11251a4ff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

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://on-video.com/movies/movie_data/file/4463904381.pdf In PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2b0e0a99fee82c766871b7701fc9d84a/zenofekedubisisititud.pdfIn PDF document text
- https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/f3cc0d60e56d67eaa465fcbb2751939f/70334114340.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5454cc6067---mijibogogagupereg.pdfIn PDF document text
- http://jjmcp.jp/userfiles/Image/file/9269323572.pdfIn PDF document text
- http://mjsolankifoundation.com/fck/imagesfile/kedogipaterawed.pdfIn PDF document text
- https://signika.pl/Upload/file/35169084158.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/86835468340.pdfIn PDF document text
- http://toanthinh.vn/webroot/img/files/wipefusasopab.pdfIn PDF document text
- https://livresdarts.com/ckfinder/userfiles/files/rokinadom.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5efc34e8d---larugusajogukukob.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab95d3ae4f9---30488652072.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608226fdf366c---89855392391.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16097b50123c5c---moluzitosokavejuge.pdfIn PDF document text
- https://textolinguisticsolutions.com/upload/editor/file/bojuzivinajidasab.pdfIn PDF document text
- http://silesiacapital.eu/data/file/78755112903.pdfIn PDF document text
- http://banglatalkies.com/dynamic-images/cms/file/87765635081.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-6-1/20210601013035674053.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1792bbfb147d843e9113428d8db3c674/98378912572.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d4fcb1c20d7e2e45bf4785cb7bda7913/bexijobufujorimes.pdfIn PDF document text
- http://paykaaluminiya.ru/ckfinder/userfiles/files/jinugete.pdfIn PDF document text
- http://madmojo.com/fckupload/file/weraxuzuvarajatoripun.pdfIn PDF document text
- http://wamer.org/userfiles/file/xujiwuwonamuwilifapexel.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce77aa071b---siwakal.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1621511326.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea95b50eea---96324402663.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sonic+exe+online+freePDF 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_off0000d44b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD44B	16660 bytes
SHA-256: `2c8b1cb7aa6dacf8150338e865ae6ce752c6dd940a2ab4e878cca4f076edf9c0`
`font_01_sfnt_off0000ff3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF3A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011751.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11751	10080 bytes
SHA-256: `e1745fa99f7d5fc7193b2975bf479963df3b30a0fd0fc7286df7015297bb3c09`

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