PDF malware analysis — malicious · e49107405d9f5c44

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 16:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 93689a733b5c2844f6886073b163a171 SHA-1: 7d48e8dfb51ec3dc3d5bdee9815f359a2ce17344 SHA-256: e49107405d9f5c44c8ae89f92552d6497e654ba01b45e99e004c6fdf3ab44998

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is a link farm on disposable hosting, likely intended to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://audit-advisers.com/userfiles/file/buvarufokarapiw.pdf In PDF document text
- http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d26165771b0---92556696335.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7318c4bb---4207138048.pdfIn PDF document text
- http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mto99luifti04ueg8cpf3mv2gn/95827738359.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3f54f4da4ecf77d08edd7e62799c9fef/bokijopego.pdfIn PDF document text
- https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d35c62b9f953c7803e20376de7c1f0b8/sakejobapa.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce06bab04a---rugij.pdfIn PDF document text
- http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/tfjnfkmrufnmkc7de9uj4t8femcjqld8/47648504474.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4f5c20e4e0f13d29616b027b17cdcd9a/bovukezefufi.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e4ed2248b---laluloxogudufupozaniraru.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609846f86b2c0---11371340031.pdfIn PDF document text
- https://curewelldiabetes.com/userfiles/file/xamofenugorutupax.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084b67020a39---puxoxakegagalivoborotab.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30bd6dae9---29638510765.pdfIn PDF document text
- http://rocb-ap.org/file_media/file_image/file/66001759825.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085afcca223d---5841604386.pdfIn PDF document text
- https://rkdestate.com/userfiles/file/goginotukofukavekokeku.pdfIn PDF document text
- https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a981f55419---64943468420.pdfIn PDF document text
- http://3sdent.com/upload/files/54374382042.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b778fa3b---wagogu.pdfIn PDF document text
- https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/d306b8ad478927d2ee2084412c2b1b4f/mimuxinusu.pdfIn PDF document text
- https://deniz-sogutma.org/img/userfiles/file/99459302280.pdfIn PDF document text
- http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6221ead766---gipowokubefaletore.pdfIn PDF document text
- https://autosaloncenter.com/uploads/file/guzoserafemajaxobise.pdfIn PDF document text
- https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8v7b9diqo9k3sapger947j0sj9/meligevegapexukejoputo.pdfIn PDF document text
- https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/j59khluqvd11ljr23u7tvc7g10/meganenom.pdfIn PDF document text
- http://ipceurope.eu/assets/file/semakobamofufefufebojefib.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=music+downloader+for+iosPDF 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_off0000ede3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDE3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105F5	16536 bytes
SHA-256: `d240c4fa2ac903b50e000def6fc265af20d5c5f9b5b05b65fe02abc1d01536cc`
`font_02_sfnt_off00013108.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13108	10552 bytes
SHA-256: `bb8653bb8723eca35c9cee0ed000e91a743f54692c74f566acd9d3f7ffa6be6c`

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