PDF malware analysis — malicious · 6f248c256b3b64fc

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 12:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 358f279e020bd8d66d3e8a72857abe8f SHA-1: 3b6bb7b86b8378d281a546858dd8b655d4eab1a5 SHA-256: 6f248c256b3b64fc60e6304936d0d416ac51442227e6195c2dfe3e4959338cae

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to potentially malicious domains supports this assessment. No scripts were extracted, and the document body was unreadable, but the link farm behavior is sufficient to classify it as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=garth+nix+across+the+wall+pdf PDF link annotation
- http://jfkanacon.org/data/userfiles/files/19730446699.pdfIn PDF document text
- http://ydtmuhendislik.com/ckfinder/userfiles/files/22010643666.pdfIn PDF document text
- https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/nabixifukefig.pdfIn PDF document text
- http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/genanivafiluninojugemusan.pdfIn PDF document text
- http://sadiqandsons.com/userfiles/files/51388831598.pdfIn PDF document text
- https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e61cd8df222---xavidezopetaletezazir.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/6359909191.pdfIn PDF document text
- https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/2mkkdne357njjn9dhfhvu64b9p/28830574424.pdfIn PDF document text
- https://vientangluc.com/upload/files/21127229377.pdfIn PDF document text
- https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/o7maqpa8bpjs4t9gs85sg7b766/mozawedodube.pdfIn PDF document text
- http://ieltsadd.ir/cache/fck_files/file/9851675735.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16124ffb018923---memunagujozodawipufinabu.pdfIn PDF document text
- https://afayl.com/userfiles/file/zekavize.pdfIn PDF document text
- https://teamcode.net/upload/files/sulagutufuzenajigojumel.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eff87ac1ba6---71996273225.pdfIn PDF document text
- https://srmhospitalities.com/images/bulk_images/files/97388527649.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160af038f2fafe---50001864038.pdfIn PDF document text
- http://xn--b1akwe.xn--p1ai/userfiles/file/40814898597.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9423712e---pusaturituselupag.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f8b2714b58dd5ee84c86319178d8153/85016613448.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bb7e0ae8---temenolozatinufodul.pdfIn PDF document text
- http://hoaisonland.vn/upload/files/9111334444.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1a3c37ea490a7ea6e45e9c82cddf1612/newufamopumefonorimuxusaw.pdfIn PDF document text
- https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/444outbmh86ql6oqg5eo0pf23j/33781772471.pdfIn PDF document text
- 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_off0000e61c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE61C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fe2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE2E	18232 bytes
SHA-256: `c569ca008d6807d86d13fbc2443d1b36dd5d356b9db219c6b71f4cfcc7badba1`
`font_02_sfnt_off00012da2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DA2	10944 bytes
SHA-256: `400c7df269d884b5d2396d37585b48fb9c89cb8c0b688115a57f21f9e02eaedd`

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