PDF malware analysis — malicious · fd927446a5f56d9e

MALICIOUS

PDF

101.7 KB Created: 2021-07-16 00:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: ada40297634df84821c31511d4755dfd SHA-1: f3377818acabed7ee0e6e57fa1e3aceb5771da9b SHA-256: fd927446a5f56d9e826fc67ee57cfaea511490fd23888fa5a50fd3718043b1de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the overall structure and URL distribution strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://dpsszczytno.pl/photo/file/9056721408.pdf In PDF document text
- https://inoxquochoang.com/app/webroot/files/images/pages/files/9067221655.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2l48m8shthq1narhm8907n3rj4/85914562463.pdfIn PDF document text
- http://abwplazaview.com/uploads/files/rujoruzepoludetuk.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/431472917361b5216b6369f163f3765a/sufuteganumivu.pdfIn PDF document text
- https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/eb083d1a6e35495bbea01ecfac86cb93/70452927043.pdfIn PDF document text
- http://judge1960reunion.com/clients/873273/File/jokajozalajisewimimaga.pdfIn PDF document text
- https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846ffdcb95f---60772996050.pdfIn PDF document text
- http://mp-hd.de/data/aktualnosci_imgs/file/bolitoni.pdfIn PDF document text
- http://rana-international.com/userfiles/files/zomovagebuvewawunaturu.pdfIn PDF document text
- https://prtl.pl/userfiles/file/pelinovudowonesanikid.pdfIn PDF document text
- https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/46t617p94kemrcgjuui02h6o0d/wojowipinobusen.pdfIn PDF document text
- http://begemot-rus.com/uploadfiles/file/2021051602462273499.pdfIn PDF document text
- http://ruihuitax.com/files/file/buwotubedukipiwijusuref.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/lj3k8cndjqdq5gfpkctvleg9c4/36551774170.pdfIn PDF document text
- http://ristorantebiscione.com/userfiles/files/29571807282.pdfIn PDF document text
- http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512121919575442.pdfIn PDF document text
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/11b08e32f4523e74872925a27a5c9af0/vexekebijebexatozegitev.pdfIn PDF document text
- http://atenngo.com/admin/sites/site/documents/32738670410.pdfIn PDF document text
- https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/76e560d8c1a370df913f3fce6d804eec/82902110653.pdfIn PDF document text
- http://wahiclassof69.com/clients/874294/File/petab.pdfIn PDF document text
- https://balaji-technology.com/userfiles/file/83295647336.pdfIn PDF document text
- https://digireg.cn/upload/ralom.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ac6967efceffc0cc2bd6272a57fdcd73/40978952474.pdfIn PDF document text
- https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c63ac10de67022a30eda70283e807477/pozidudofebujoguzopu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bruxism+and+stressPDF 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_off00012c00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C00	17488 bytes
SHA-256: `a2fc57332892d5a2c0920a52626468c453b16c25f93093e5f393c419bef4380e`
`font_01_sfnt_off0001598f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1598F	10500 bytes
SHA-256: `83244055787a06711e40791e4c9069a196f03b49c8e7c56fcd19e2e8fd90b7e2`
`font_02_sfnt_off0001717a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1717A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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