PDF malware analysis — malicious · 6b7d1cdccf6b3176

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 00:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 5c4d78d3233692d53ac4f15986dd0bbf SHA-1: 558b699b98e955e2f6d1d79591d6e84a3eca5253 SHA-256: 6b7d1cdccf6b317628a50464ce25505dbe42623b252cc177a041d026df2d0148

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The embedded URLs are likely used to redirect users to phishing sites or download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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 https://philabc.ru/uplcv?utm_term=how+to+logout+imo PDF link annotation
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/edb4cc8bc9e64662a85035db61adba38/pagepapepimepukegibufituv.pdfIn PDF document text
- https://comtraining.cl/userfiles/files/36751255164.pdfIn PDF document text
- http://beta-rc.com/upload/files/14725722957.pdfIn PDF document text
- http://loaamtran.vn/files/usersfiles/files/dofodamik.pdfIn PDF document text
- https://mmrh.myagenda.cz/pictures/editor/files/zifubud.pdfIn PDF document text
- https://paintingwithapassion.com/nbloom/fckuploads/file/gebamagesegowokikawebaso.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613450423fe69---janogerakozemadidob.pdfIn PDF document text
- http://seatraderhk.com/userfiles/6521405695.pdfIn PDF document text
- http://opuspointpartners.com/ckfinder/userfiles/files/zowunevesokejagibotimoli.pdfIn PDF document text
- https://onderdurdu.com/upload/ckfinder/files/lowekegoxupegewutowuseb.pdfIn PDF document text
- https://rubenoferro.com/userfiles/file/kukevunivukupojorosa.pdfIn PDF document text
- http://lulanjina.net/upload/files/wekonupotuzogeriw.pdfIn PDF document text
- http://irvinenott.co.uk/ckfinder/userfiles/files/53661725232.pdfIn PDF document text
- https://kientrucqhouse.com/uploads/image/files/rafek.pdfIn PDF document text
- https://shoppingplanet.ro/ckfinder/userfiles/files/dopofologepokofesavojuvip.pdfIn PDF document text
- http://sahrugs.com/userfiles/file/28588847629.pdfIn PDF document text
- http://radissonhoteltraining.com/userfiles/file/23117634710.pdfIn PDF document text
- http://cablexconsulting.com/Upload/file/wudalilasaz.pdfIn PDF document text
- https://shidoremicrosys.com/media/jikitudirogozimitov.pdfIn PDF document text
- http://forter.vn/hinhanh/file/gazibexabutabomu.pdfIn PDF document text
- http://abwingssuffolk1.com/uploads/files/10812544390.pdfIn PDF document text
- https://elitstroycraft.ru/source/file/zoxoxisevidomokifowoje.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/094c4643ce9d5f52be46dc6274d3aff6/kosowubibowugokemoxebusuk.pdfIn PDF document text
- http://bestpokeya.com/uploads/files/43627124322.pdfIn PDF document text
- https://lensmam.com/userfiles/file/39053314016.pdfIn PDF document text
- http://luisacortesearchitetto.it/userfiles/files/48872815919.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_off0000b8d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8D0	16328 bytes
SHA-256: `b0db7b15bf7a9c208390e74224d0dff3627b8e60d1f6e16fcd107a2b662fe03c`
`font_01_sfnt_off0000e21c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE21C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fa32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA32	9960 bytes
SHA-256: `832a0321894706e24c82884bd29648c977b976fbcd884c6816fddb87c8ed8cbd`

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