PDF malware analysis — malicious · 15ea9a866e1e6337

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 10:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 460776703b7d86dc036c8df844e9c37d SHA-1: e88a6d666dca41cc35ac224fc7fe380185a4e411 SHA-256: 15ea9a866e1e6337ba66332eaf442e0d542ec52c97fff73043e243d8cc7a1739

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to phishing or malware-hosting sites, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://immodraft.nrw/images/architekten_agentur_images_/file/41398284737.pdf In PDF document text
- http://kiemtoanhaiphong.vn/upload/files/safujiwonidas.pdfIn PDF document text
- http://narnivet.com/userfiles/files/resev.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6db2acad1e---43940445561.pdfIn PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/237d9ececae792061ecb1b0d88de6cbd/42703490783.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/18f379ac188750b34275663da37d2d16/96632529546.pdfIn PDF document text
- http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ef26c5141---93370586604.pdfIn PDF document text
- https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7b1e2418---48154232293.pdfIn PDF document text
- https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/7421775cc917cb77da37afc3894cca49/fizuvaxivitizalogoveda.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c476d51e270---65161632008.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bb14eba45---74590760204.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sso2ikbjeod3nsf5ug2dabie9a/sizekeke.pdfIn PDF document text
- http://alemotta.com/resources/original/file/ninukonowitiledigeg.pdfIn PDF document text
- https://cualuoihoanmy.com/uploads/userfiles/file/dunizorirurixu.pdfIn PDF document text
- http://www.deopendeur.org/imgUser/file/xivugure.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160742e0a3937f---24869616529.pdfIn PDF document text
- https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6ed3e4382460ebd47c2b2dac33eac607/51902161758.pdfIn PDF document text
- https://zoorichi.com/temp/fckeditor/file/81097571229.pdfIn PDF document text
- http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/tovosazoveledelutoredez.pdfIn PDF document text
- https://implant-drill.com/userfiles/file/lirakuxelunironud.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97b6137af---lesalunasaferupatuba.pdfIn PDF document text
- http://upsshop.ru/ckfinder/userfiles/files/nuvozoradapalikesipore.pdfIn PDF document text
- http://outspokenholland.com/userfiles/fckFile/20210514090051.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a94ac16026ad2592f2412cd6636a5d12/vunutul.pdfIn PDF document text
- http://broadviewlibrary.org/uploaded_bvlib/file/2862644022.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0aa28b20---37795941950.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/27cd76054124ed54afadcbdbf4b44c67/xofaxoniwufilezazek.pdfIn PDF document text
- https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/35afa7c96f5853a6006b0e263c6b250b/latanujejin.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=in+the+evenPDF 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_off0000eb51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB51	24412 bytes
SHA-256: `d01392ae1804f0bebdb644c89dd1ce951c0d8acfd7267d63b24791aebb934e84`
`font_01_sfnt_off0001277b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1277B	9536 bytes
SHA-256: `8cf2ea152a97b11622c020cf2e796869bffa1949304191a498bd457ed3584d52`
`font_02_sfnt_off00013be7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BE7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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