PDF malware analysis — malicious · c2fdb6cf328d454d

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 19:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: ffaf1811abed2d121a01e1adbb93438c SHA-1: 68ef18347a5bac5a7a47fae5664a58a992ade549 SHA-256: c2fdb6cf328d454de47b793595b440a13195d90fe67f2dfe6f8c59024ffce59a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to potentially malicious sites, possibly as part of a phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 5

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://abwbaltimore.com/uploads/files/mapejukezi.pdf In PDF document text
- https://agrilaui.com/userfiles/file/21744994193.pdfIn PDF document text
- http://kramor.bg/userfiles/file/jekosepof.pdfIn PDF document text
- http://cybernet.asia/UserFiles/File/falipubinega.pdfIn PDF document text
- http://vankouwenenmastop.nl/UserFiles/file/89375300389.pdfIn PDF document text
- http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160863d77598bc---81756171856.pdfIn PDF document text
- http://szkolaprzybranowo.pl/ckfinder/userfiles/files/wulegijidatebutu.pdfIn PDF document text
- https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/9fc7de7d77e5f825dd003e3e2aa5f097/48383717675.pdfIn PDF document text
- http://csc0898.com/userfiles/file/20210802035250_vijtyy.pdfIn PDF document text
- http://ekolojikweb.net/upld/userfiles/file/bugagaxibivajesiresozili.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6bf2bc74a---55691404024.pdfIn PDF document text
- http://autoscuolemontagna.it/userfiles/files/lusokenazilo.pdfIn PDF document text
- https://epponline.com/mentorfinancial/page_images/file/jesofilavejof.pdfIn PDF document text
- http://naasschoolofmotoring.ie/fckeditor/userfiles/file/tofanog.pdfIn PDF document text
- https://beatmuellerfoto.ch/userfiles/files/85288449217.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f3c233fd8---walorejodalatugokalexan.pdfIn PDF document text
- http://sapaethnic.com/webroot/img/files/30703188673.pdfIn PDF document text
- https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ptkk737s4qs6pmt0hljbe4v3j9/rodalopo.pdfIn PDF document text
- https://springkasteelhuren.be/userfiles/file/fujaboluwotesudo.pdfIn PDF document text
- https://binarbaidequipment.com/public_html/userfiles/file/47469457487.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cockatiel+mutations+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_off0000e478.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE478	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fc8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC8A	17064 bytes
SHA-256: `09c93eb314e081ae0147687492640393499cc7a4870be8bd27b8d6930c9abb2d`
`font_02_sfnt_off000128a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128A0	10904 bytes
SHA-256: `d242cf99afc295f378d90635afae924774df1ac7d8f96bb7edd2e6f3517ecbb5`

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