PDF malware analysis — malicious · 583a661a1e198599

MALICIOUS

PDF

81.7 KB Created: 2021-08-20 20:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: ddb775af6c20453522aec79118209ecc SHA-1: b766b582fa1a8f256bcd8d38c532684f63180203 SHA-256: 583a661a1e198599192caff31a34060f6762203a5c15abc0dbad45fbe73d487b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points to T1566.001 (Spearphishing Attachment) as the likely initial access vector, and the nature of the PDF suggests exploitation for client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

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://dhesient.com/media/gitesimeraxi.pdf In PDF document text
- https://5udua.com/contents//files/5912524373.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609e604a29230---92835673669.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/589c884960c678a487e36368b06efeec/jisorebazos.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50459551ee---risamafujisivumitor.pdfIn PDF document text
- http://animalscipublisher.com/files/upfiles/file/resireviburodez.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e2d06e82c---6186462745.pdfIn PDF document text
- https://bawwabatrizq.com/userfiles/file/8575096673.pdfIn PDF document text
- http://phone-server.com/userfiles/file/lenafonobovezupimis.pdfIn PDF document text
- https://fototipia.hu/files/files/90484412267.pdfIn PDF document text
- https://cristalensi.com/public/File/42520929924.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835ce30499a---67993014765.pdfIn PDF document text
- http://stphilomenaonline.org/userfiles/file/rowisojupaliru.pdfIn PDF document text
- https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2du3ig5dfno8sfj40avhnjkrd9/89495105450.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdf52008d7---74101395727.pdfIn PDF document text
- http://markasib.ru/ckfinder/userfiles/files/14798059703.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/n9cbfh205n61b8g7bt5qt8ira6/moxamuvukufa.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b6f766cbc33f71b9085746aec1c36885/93133276761.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751bb625af7---vetivixazuvavovefedezoju.pdfIn PDF document text
- http://travellightnepal.com/userfiles/file/dereforovenipifasuzezuja.pdfIn PDF document text
- http://hanabi-la.com/uploads/files/18728310320.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/14690634467.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5f2b3743d---xobunipowubexorezofolivol.pdfIn PDF document text
- http://wanyuantemple.tw/userfiles/file/digigeminumudif.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/jpnrlak2smbr7rjqb9sla4120u/zotarelefuwebofaropetigi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+insert+table+of+figures+in+word+youtubePDF 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_off0000d98b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD98B	17348 bytes
SHA-256: `d3aec1025ba2b6f4e79fe186ef9a34a12ff815ad666dcc09194cfbbda5e56a27`
`font_01_sfnt_off000106d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011eec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EEC	10960 bytes
SHA-256: `428bd38ae8f7f865cc8ad985a73bfb014d102e2b8acb688b9a30280fd0d0c2e3`

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