PDF malware analysis — malicious · a21089bd18783dc3

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 02:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 2f4f82bc082ddb7602a47e90be390f3d SHA-1: d18d435f7b9d2c8c9a332ee83fd10871b0a95467 SHA-256: a21089bd18783dc3a2892e47e10bc852187bb5900b0dff1bad0ad28ed618c57d

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document's structure and embedded URLs suggest it is part of a link farm designed to redirect users to malicious content, likely for phishing purposes. The 'SE_CALLBACK_LURE' heuristic indicates the document attempts to trick users into calling a phone number, a common tactic in tech-support scams or callback phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
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://leaguengn.com/userfiles/file///wigeminuwute.pdf In PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba45613d83---17921664522.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f458586a7a---85348396140.pdfIn PDF document text
- https://dbjadow.pl/attachments/file/29719062485.pdfIn PDF document text
- http://jagodkaprzedszkole.pl/userfiles/file/75622256963.pdfIn PDF document text
- https://coluer.ir/documents/file/28755980240.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6114d4c10c35d317a3cc93b420d157fe/dupijifukopamisi.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe0ed4fa79---nejirokewugexefabutebad.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0ccfdf255f30a97b8503de7daeac4257/dojogumadibexe.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/533c97beef14fa3bbdbb4328ce9991a4/vepalimivutefodobus.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/l479c6383fvtocqjndq0lquder/51248346091.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/152d9387f36d263d83ac1ea29557d62d/duzomozaj.pdfIn PDF document text
- http://www.victoriousintl.com/new/resource/files/9499044467.pdfIn PDF document text
- http://polish-house.com/uploades/fckeditorfile/75741559474.pdfIn PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/18f7e089c3e3c6277c254378d12b30e5/57598076436.pdfIn PDF document text
- https://goodluckfishing.com/ckfinder/userfiles/files/sejazaretogolame.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/eb22f4bb9d5dc26719f03eea4632ea33/91126528966.pdfIn PDF document text
- https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/da4d3a6220ef5ca27c4d8c130e2ffa3a/mokadisanuxupufuxegutupu.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608062bddad85---zivumivosunuta.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/q06jof837c4etgerfik2ngbgbb/4717402262.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bf117d80179261a48d267aae6e279a16/lajigupuvozarexega.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s338sdamk8cp40526rbu47j6f2/jagajuzidixuweboke.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a80259d8d2a---befirow.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9adfd0dfc3---boparizamodugepek.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7vmah2pm4di2rdnb0lfnbj896o/fapirogowajoronokix.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091712fd09e8---47035154545.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=c350+coupe+for+salePDF 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_off0000e237.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE237	10740 bytes
SHA-256: `6aef5c9fa2f2659d4109694c49f1a082518e5a1768cf7005cdcf3fff6e791223`
`font_01_sfnt_off0000fb0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB0D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001131f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1131F	17428 bytes
SHA-256: `856dea9b8b9aa7bb15b45917ef360793b0696c301d9500aee105fdf1c320c97a`

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