PDF malware analysis — malicious · b73824413c34df48

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 03:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f31d6f4210e52b10d4cb1793e85f873d SHA-1: f47469919aa21cccc93da0c661c7c9e08e610ec9 SHA-256: b73824413c34df4808d04989183e135ec0a1696a2a22e9cb90409d1b54be6d73

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, indicating a phishing or redirection scheme. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfd155db2---vodirekafavajevinaga.pdf In PDF document text
- https://autotrans911.com/thread/admin/uploads/file/64622003381.pdfIn PDF document text
- https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uu9fnsfd65ovkoivc74mjtb3qg/sanabapelibozawu.pdfIn PDF document text
- http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6cd9e08d---jopuz.pdfIn PDF document text
- https://biodent.ro/m4fm_files/m4news/ck-uploads-files/wekuzudilo.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gnp1a9utq04teil35svcl8pl36/36049272629.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd77acbea---viroxemefirobaxowijakawa.pdfIn PDF document text
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8ae7dc48---sapibetavopuwujatadiwati.pdfIn PDF document text
- https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/52c702dd06c5dd252a9fe537989e876a/zasakabodunuvixomiwaz.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a8f65602648b29e4909eea082ec256d2/8728055912.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/872537047efb851e32168f2473bdde15/regonijovu.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/so2gjq2i3am91mc41m6492tbmm/8530849599.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827baaaa0f---36415014330.pdfIn PDF document text
- http://aite-materials.com/upfiles/file/niwurafodakuwuwobit.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b02c8010---56308287415.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/prs317u6mriheb4cl28o3legb4/59526246709.pdfIn PDF document text
- http://banphimchuot.com/userfiles/file/92714239286.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea40a9f0d---8356840708.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160813b701daa6---jupuvivedizawufonin.pdfIn PDF document text
- http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b3a8e48dfd570fbec204214952765976/kofuxirivuj.pdfIn PDF document text
- https://woodfur.in/userfiles/file/javagivezup.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jrobu1c0r0lsc84f8p43jglam4/ligadasazunowegumul.pdfIn PDF document text
- https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9be697a2adabd53189eba6ffcdb62313/nunesekofidaravaju.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=now+a+cowboy+needs+a+hat+songPDF 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_off0000d186.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD186	16160 bytes
SHA-256: `27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46`
`font_01_sfnt_off0000e6fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6FB	16860 bytes
SHA-256: `7a4b696e57c5fe808ea787e5cd5143767d92d780d8b1d62db8c8067d23c31560`
`font_02_sfnt_off00011324.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11324	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00012b3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B3B	10728 bytes
SHA-256: `31686306e0cc4fe8478c0ff706e45be6db5efbf544bfe22d839c5b8a602ecf5c`

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