PDF malware analysis — malicious · f51b426dfe92b23b

MALICIOUS

PDF

86.9 KB Created: 2021-09-08 05:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 92c979ee3e8495fe54fac092d61020bd SHA-1: 9b0bfb2227c9314978f02ccddbe1c9602d8221da SHA-256: f51b426dfe92b23bdca5b78c9a9e1ceac55a3e9871bc61a5ce663fad479c463f

172 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous links to compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 8

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://allytemp.ru/uplcv?utm_term=oxford+cardiology+mcq+pdf PDF link annotation
- https://gachbinhduong.com/upload/file/baxafovanibupigupe.pdfIn PDF document text
- http://cafegreenwichvillage.com/uploads/files/lofozefemebu.pdfIn PDF document text
- https://airshow-bg.com/file/wolijaluvoxamopizob.pdfIn PDF document text
- http://abwcolley.com/uploads/files/pepanuburevaxagogovar.pdfIn PDF document text
- https://kermoulin.com/userfiles/file/xugoxasowovari.pdfIn PDF document text
- https://baptistfriends.org/media/62387569423.pdfIn PDF document text
- http://beta-rc.com/upload/files/49120605806.pdfIn PDF document text
- http://ntvietnga.com/upload/files/ganitovebawupuwinog.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/45b35ed7734967b5411ad02935690b6b/2112335308.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102f2b825a35---zufavizapalefusen.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbaaa98e3---bopikigoduborape.pdfIn PDF document text
- http://dighakanchaninternational.com/FCKeditor/file/42849252157.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160842b6b802e5---lumofonoretosodanewam.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbdef5eeb4---22032305839.pdfIn PDF document text
- http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/sezaxerabirenepixajot.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c620d4bd0---mitifajodup.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff138396640---52329389202.pdfIn PDF document text
- https://www.l-games.jp/js/ckfinder/userfiles/files/38959283111.pdfIn PDF document text
- http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607079e273ec4---1020191817.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16119c73b53a18---1021345461.pdfIn PDF document text
- https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074bee1a72e7---17638195154.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095c9e57ed2f---52796500268.pdfIn PDF document text
- https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ba849202ea36964f2ce70d409f960747/gigipavame.pdfIn PDF document text
- https://suavitinhtannha.net/upload/files/buvepu.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608068b3c2464---60836321259.pdfIn PDF document text
- https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/7547755710.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_off0000edfa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDFA	10848 bytes
SHA-256: `774ac65bd023962034eb1a69b8d91de07c4513539bd049f5073c9dc9c989c85a`
`font_01_sfnt_off0001067e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1067E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011e90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E90	18168 bytes
SHA-256: `6b8244e7b8b171a3016790729fe75e83cf396172c461cb87723779d2b768ed30`

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