PDF malware analysis — malicious · 45d3a89b69df7c02

MALICIOUS

PDF

94.0 KB Created: 2021-06-28 00:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e6464b3e9643da4b8b618c67c9d0aad1 SHA-1: 8ef3dcf964c02f520782371dce80793e4f5b8da2 SHA-256: 45d3a89b69df7c02f39536dd99e001234ce861a4ccddae191f870ccec6bd9b8f

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 and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to other PDF files, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI links and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://nomylo.ru/uplcv?utm_term=windows+xp+tethering+driver PDF link annotation
- http://mstreatmentadvances.com/userfiles/files/28498702919.pdfIn PDF document text
- https://poolpoint.be/uploads/file/fagixerixezisepiborubajip.pdfIn PDF document text
- https://aradovan.com/userfiles/file/60443032584.pdfIn PDF document text
- https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/d92tntlg2a3hgcjscdfr3sgo2j/80071943754.pdfIn PDF document text
- http://mhinflatable.com/upload/file/91768645887.pdfIn PDF document text
- https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/3ll7a8f6ti566f58gti6i2n7s7/tetuguwog.pdfIn PDF document text
- https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ii00budog5lma55vmfi0tkvqo6/34049319316.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/260d942e15cb83a899821ba6d885d1ae/54592031527.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3590a8b6f---42651046518.pdfIn PDF document text
- https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/fh3tn1lc61lovdmg5h8hmh8lvk/sugutodakovosawomokituzo.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfa6250c4---wamugojaf.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e42dc74c40---sijitogel.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d19877e10---feretawinel.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/34a078c02fb76029ee07fa8515284be8/85279214854.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/05204f4605665e0b2f34093278fd5dbe/vevosonororulijajokij.pdfIn PDF document text
- http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3d9b1a1a---52394650350.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7bf28c7f6---47340314636.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608162ff5f521---wilimunoza.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2ec510eecb97ba8a8eca86063eae4292/rifom.pdfIn PDF document text
- https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/hf3dkjm85gqrc56sietnnb7d0u/rujavixolibubijed.pdfIn PDF document text
- http://www.niziointerior.pl/upload/file/revowesepuziwupa.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05dcad34a4---41724667988.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/47876494154.pdfIn PDF document text
- http://artospace.com/pics/file/bipudipis.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609696a5433d5---surataledaramulameba.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_off0000f393.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF393	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010ba4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BA4	16488 bytes
SHA-256: `1d039024b519754ef513dc366699c1aef0e5daefe3e1bf03be0be9033722f88a`
`font_02_sfnt_off00012250.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12250	17708 bytes
SHA-256: `6c0228cd97b57878db1b9720fe77a2b24cb398bd08a3f54f5f59939e98f99350`
`font_03_sfnt_off00015073.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15073	10708 bytes
SHA-256: `513bba8b92fb45b5c8ff07f8d9506d49f702e255b40ba90902756e10838d63bf`

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