PDF malware analysis — malicious · 17ca84c6f78c1e87

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 02:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 6ffc6f5c7a6a338ecb3aeab5fed7729c SHA-1: 667229fd833cbf38a736c88b53a618027dcae57e SHA-256: 17ca84c6f78c1e875c3a648ed670ddeb9e34067f9c0734ea9c1a192389df06a2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to distribute traffic. While no scripts were directly extracted, the PDF format itself can embed JavaScript, and the overall pattern is consistent with malicious documents used for SEO spam or to redirect to further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

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 https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9d466d7e9---4021465854.pdf In PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160caf98878095---42659937896.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1c309f16---30953351201.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c09162f10eb---18999634139.pdfIn PDF document text
- http://shreyaghoshal.com/konadnew/userfiles/file/mubuzuluwezeporuxusijipa.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fsni3hcdhnccniuunchlta3m8c/10496657942.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e23b53fc2---kadevixugivatamilawabidaj.pdfIn PDF document text
- http://bright-inter.com/file_media/file_image/file/raribon.pdfIn PDF document text
- http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/powumoxavadarid.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f9c1cf740---30991374092.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f91a4b4aa---xatujadajasoxuwugexukop.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c38ed345f---fitijebat.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-6-26/20210626045507732663.pdfIn PDF document text
- http://tubietelbar.hu/uploadfile/xajifefivujesulenegowazu.pdfIn PDF document text
- http://deltastal.ru/userfiles/file/38760023353.pdfIn PDF document text
- https://agmatbaa.com/upload/files/nadasosonumopirirusojob.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4683472fdf1830c3d669c1f62b85aee8/fibini.pdfIn PDF document text
- http://hawks79.com/clients/85064/File/76029969675.pdfIn PDF document text
- https://tonwen.org/userfiles/file/12000939588.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/d4ef3d51b122a02ce7287c9cc0c8428d/3381610388.pdfIn PDF document text
- http://solarhomepage.ch/fckeditor/editor/images/file/38843661916.pdfIn PDF document text
- https://mygoaltv.org/ipp/images/uploads/files/3479104536.pdfIn PDF document text
- http://paoladebenedetti.eu/userfiles/files/70398356476.pdfIn PDF document text
- https://mbamantra.com/ci/userfiles/files/3777118184.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3263oa5i5iipvedmg42f7d5on4/molivefarozetoza.pdfIn PDF document text
- https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e383e6c0f8cf3ca8a667a223e428ff85/8478523497.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=domain+controller+active+directory+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e013.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE013	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f820.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF820	1700 bytes
SHA-256: `15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8`
`font_02_sfnt_off00010033.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10033	17520 bytes
SHA-256: `5c8d9c9af21d9a6c63f81171ae776658239afa0d432b90dc96b8435b52b7c99e`
`font_03_sfnt_off00012e57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E57	10796 bytes
SHA-256: `cb040fce5d67f887092078fc1550e62633f909f61bba7934f5dcaf8a85742110`

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