PDF malware analysis — malicious · 55414909b9239652

MALICIOUS

PDF

108.4 KB Created: 2021-07-01 15:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: f4b71bf63ad392a4fdc1bca78e245177 SHA-1: 694eb9bc78e4d84c3a495528b778774ea14bc705 SHA-256: 55414909b9239652bea77ae7789db92f3d568ed18c34a313a6e2a2e093c4889c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites hosting other PDF files. The primary purpose appears to be directing users to these compromised sites, likely to deliver further malicious content or facilitate phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9931

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://crewmak.ru/uplcv?utm_term=how+to+increase+bicep+strength PDF link annotation
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41f92c02a---safonosofixoxusekowabup.pdfIn PDF document text
- http://billsky.ee/files/file/51307023069.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160907940809f5---18544787525.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f6ef5b8ca7bd022343aa0d083d39805f/lubipaxolugepoxekipas.pdfIn PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6abfa67b12fa83a6a132154fc954551f/1110601377.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d54484559ce9397639f770095462ef95/11702999441.pdfIn PDF document text
- http://clair-environnement.eu/catalogue_dynamique/file/53776336982.pdfIn PDF document text
- http://www.bash.cl/media/file/pudawid.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/32119462970.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2f4f0b12e438c7b8ff9564bdd11e94bf/fapadurujugonerukijuwul.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6bd6cffe---mubuwatavowajama.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076c42960649---61951165433.pdfIn PDF document text
- http://legalinet.eu/userfiles/files/5647188512.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609705fce1808---lubumolula.pdfIn PDF document text
- http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089e308a47c7---89525401154.pdfIn PDF document text
- https://asiarsolutions.com/userfiles/file/88797958834.pdfIn PDF document text
- http://netinflux.net/userfiles/file/zamekidopumu.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/dfq4jmg1n5u49acoqe4c7tb1s4/kevenoxibujegosif.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c88e7deb1---keropozezukugubukugusopu.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6084e7320---61206196993.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1e884732---3061817373.pdfIn PDF document text
- https://susta.vn/userfiles/file/numuwiredirupawo.pdfIn PDF document text
- https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1g2rkeaecva3ff399ubt6ijigj/bejuzuzepofewunujatax.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/239c9a402bb56638e78b2bd4d6945a5e/20568175022.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607199dae4f3e---xefulo.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_off0001487d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1487D	16492 bytes
SHA-256: `c5e62c178fbcfa0f227aaa8d7616bc9a174b49aed0f7133a2db7b6af8c93abe5`
`font_01_sfnt_off00017356.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17356	10824 bytes
SHA-256: `cd5c29fa70285080e2b1085aa4984b3557ffec3bb65745bac9b0124ac800b02f`
`font_02_sfnt_off00018c13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18C13	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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