PDF malware analysis — malicious · 5853585ccbbffeb8

MALICIOUS

PDF

82.0 KB Created: 2021-07-28 00:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: d55479c7b7d0c23b5181cf498834f4a7 SHA-1: 252dbc5f6a1b72223136459cba466729e0014187 SHA-256: 5853585ccbbffeb8c4fefec5f9004891459781ea8f1f51f32bc7f77f19609b83

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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 http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ae609170---lusumomegobanirenebo.pdf In PDF document text
- http://silesiacapital.eu/data/file/961527551.pdfIn PDF document text
- https://handinhand-daycare.com/ckfinder/userfiles/files/48828171372.pdfIn PDF document text
- http://sushigonewildtogo.com/uploads/files/fokuxife.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f5fd97f4aef795164ddbf344a7adc6b2/59798472852.pdfIn PDF document text
- http://sotel-perm.ru/site/file/35800664275.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/da6972c34fbb1457eddca165b4c36a7b/64280676936.pdfIn PDF document text
- http://abwmarlboropike.com/uploads/files/jibofopilow.pdfIn PDF document text
- http://przychodnia-felinskiego.pl/uploads/editor/file/nomumemapa.pdfIn PDF document text
- https://elemental-ia.com/userfiles/file/4445943573.pdfIn PDF document text
- http://ghalemdi.com/userfiles/file/jopopimidemuvinos.pdfIn PDF document text
- http://swissfun.tv/var/www/porn4me.ch/web/ckfinder/userfiles/files/53529682154.pdfIn PDF document text
- https://chung-pei.com/userfiles/file/7522605777.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/fifajepaxivajivutiva.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd732e517---lopalum.pdfIn PDF document text
- https://vresponse.net/userfiles/file/19542895246.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c0ffdf308---juxupakawu.pdfIn PDF document text
- http://alfavit.tv/userfiles/file/jubirikiwubudo.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/pcreedudb1l3ibdc6smot14u7c/43879743686.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a565396dec2---13599947282.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3201f6ab---2847290147.pdfIn PDF document text
- https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160712d95a75cf---5531100272.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b635ed3dac5---81782410878.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82c7e1aff---72306392757.pdfIn PDF document text
- http://fittbikese.hu/files/file/49430972764.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=loi+des+noeuds+loi+des+mailles+exercices+corrig%C3%A9s+pdfPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c4f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4F9	16924 bytes
SHA-256: `b4502e717aebc22b799136c121b50aa2e622496b77d8633bfb342dfe11aeebb1`
`font_01_sfnt_off0000ef12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF12	16144 bytes
SHA-256: `fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516`
`font_02_sfnt_off00010492.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10492	11180 bytes
SHA-256: `8f8b068bcbc427ad01392ff6aaed514f696d2b457ed1878bae64f3f4589a1f99`
`font_03_sfnt_off00011e2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E2B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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