PDF malware analysis — malicious · 01cf89130a7e0b1f

MALICIOUS

PDF

102.5 KB Created: 2021-07-14 09:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: edddd9a05816c05f167e7212d21c5654 SHA-1: 0f56e686037bbbccb414b70916d3bfc1c06c67d5 SHA-256: 01cf89130a7e0b1fb1b3148e5db675ec5b0ec4db939dd85db505c5e1b2694eb2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9874

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://huntic.ru/uplcv?utm_term=probability+grade+11+questions+and+answers+pdf PDF link annotation
- http://cariboohose.com/userfiles/file/bexajipoga.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed81f4be50---33910984719.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609426aa2a479---71697499775.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c65450363---31624191382.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ed3c363e---10074188021.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/19bdebd3aabf1728223bc0b0a3505dad/42581208278.pdfIn PDF document text
- https://clickkedai.com/userfiles/file/97258381258.pdfIn PDF document text
- http://a2itsolutions.com/chop/multimedia/userfiles/file/lutukororagemivaz.pdfIn PDF document text
- http://polymer-optix.de/userfiles/file/79301717843.pdfIn PDF document text
- http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/fatumavoxuluvu.pdfIn PDF document text
- http://inphuduong.vn/upload/files/zizikejagib.pdfIn PDF document text
- https://ferado.vn/userfiles/file/11646315327.pdfIn PDF document text
- http://blevy.com/ckfinder/userfiles/files/66013070027.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609239bcc0438---badadejewatepol.pdfIn PDF document text
- https://n-zvuk.ru/upload/file/feretafuxuvufalefada.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1071d75151---68584366277.pdfIn PDF document text
- https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/901ab529e544352f7972899c1186433d/vatalirageteragexijo.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd9442340---76707031620.pdfIn PDF document text
- http://kiuruvedenlukio.fi/tiedostot/file/memopizojuwiv.pdfIn PDF document text
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c2f626077a26771d50e71d588f5d32b9/xuwezomedikawe.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe6702aa9f---84508754376.pdfIn PDF document text
- http://nusratali.com/userfiles/files/jufobowami.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a2c5c9794194bf100977e8338b58b2fd/kupobiputalofaxufin.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/v7ofgmr6tevtvrkvkg4g4sesee/84474033326.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010e8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E8D	16088 bytes
SHA-256: `63b811098fedcf8ec719f6c9f22863b23ab0523da556c1e3b102ed91b1b02688`
`font_01_sfnt_off000123c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123C7	20188 bytes
SHA-256: `8649febe520b0389686a0e2443d65075b4d8f14dee1738d358bbd8a2b9c195bc`
`font_02_sfnt_off0001599c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1599C	11312 bytes
SHA-256: `22917d455e1f74c4f14a7d8d5bbeaa3ef1ed1200113958066b3bfb483f000d81`
`font_03_sfnt_off000173bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x173BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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