PDF malware analysis — malicious · e66f34381526f221

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 02:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: b725f0a3320638661ac01b0ecf090059 SHA-1: f99ff96bf89e2c69e37b1d26319766bf9b609cec SHA-256: e66f34381526f2213d8faf5d64aecea99bd4e5ba6b8db3f350dddb62a80c89b7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting domains, likely intended to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=subject+verb+agreement+are+and+is PDF link annotation
- https://edu-mate.kr/_UploadFile/Images/file/renazo.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/23931411946.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7e4a97d1e1b84f58c8748a5b5e71e98e/56881262827.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a28b9d795---45233901200.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-5-24/20210524134944179307.pdfIn PDF document text
- https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/713f00c9cfb3db0a2b66d04e4b74963e/60673747803.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/906750d118b0cd62a6b1cec89390dbe4/44077424831.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1967f89d23---33601843639.pdfIn PDF document text
- https://bd-sokolovska.eu/userfiles/file/99246793474.pdfIn PDF document text
- https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e54c31924---30663898875.pdfIn PDF document text
- https://patoman.ro/ckfinder/userfiles/files/pewozetozadaxir.pdfIn PDF document text
- http://elitvorota.ru/f/file/xematakazed.pdfIn PDF document text
- http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liwewejo.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb83cd48a---67146520358.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ng4hcheum859hfrfk5r4qrki5d/xukim.pdfIn PDF document text
- https://kamarkosong.com/contents//files/kuvuwesigurafumube.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb3b36d5d---werapewafijos.pdfIn PDF document text
- http://bannhuaduong.net/upload/files/ginegebixujapeno.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e189827e8---77581708299.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9e9e5820d0342430d54ae9abc1e28a12/110160804.pdfIn PDF document text
- http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606d313c656de---2798271542.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/725d281880ee14df80c9faad432a1323/kivuwovugujujizisarigite.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1524b97397e3bffec8568a471555ca99/zixez.pdfIn PDF document text
- https://jordan.si/dokumenti/file/mulupuwotajeronijufiza.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee8c09e8a7---1545609847.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_off0000e8d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8D5	17824 bytes
SHA-256: `782a0981405e4a75bd36b6b49380886594e75de5f575eb9b3bee6b665b679271`
`font_01_sfnt_off000115f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115F4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E0B	11060 bytes
SHA-256: `683b47f5bd465a6b0ef1ed6f69dd1376fc328b2bb5cef65178b8d6539a57971b`

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