PDF malware analysis — malicious · edc112ae2fc31b57

MALICIOUS

PDF

86.3 KB Created: 2021-08-26 02:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: f46b442e3d26aa340c44c6104e69c608 SHA-1: 974e06f29dc63b58584ea109b7edc3cf8263fa08 SHA-256: edc112ae2fc31b575e9b3b380081a9f26a13f943aa83022dd1bf9fcddab3bcbe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the overall structure indicate a likely spearphishing attachment used to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://xn--j1aii.su/userfiles/file/78333956546.pdf In PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4156c13e2---60056634927.pdfIn PDF document text
- http://arcomproltd.com/userfiles/file/53475849608.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ad186f08619a42f1cbb837bf016f0555/wabikupelegelejezovi.pdfIn PDF document text
- https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/77ed59b3dc4f94734f46ae5692a8700d/tonemosuzusutegozoxo.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6a417bfa996b5673bf8696741816ddc1/jorakirefuk.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6f5a930227c0619915515e6ff7499ab1/tixubibukivilupokugo.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608816a7d0591---lasefimomisubopad.pdfIn PDF document text
- http://boston.pl/fck_pliki/file/buzifadosinepepajibuzus.pdfIn PDF document text
- https://elemental-ia.com/userfiles/file/3656770811.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4fa2ac45---musuravilofulanakive.pdfIn PDF document text
- http://kidneytexas.org/clients/861060/File/rirosubopobaxadujerifoni.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/18766170430.pdfIn PDF document text
- http://www.anclupnapoli.it/userfiles/file/sejevosozixotife.pdfIn PDF document text
- http://pizzeriagiganti.ro/imagini_ws/57397041555.pdfIn PDF document text
- http://fred-robin.com/ckfinder/userfiles/files/68714462213.pdfIn PDF document text
- http://voszveszprem.hu/_user/file/jitufofexozidozemivabigil.pdfIn PDF document text
- http://conhantaoankhanh.com/webroot/img/files/winojiseni.pdfIn PDF document text
- https://betenagro.com/sites/default/files/file/rolonulesezizupi.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1626097011.pdfIn PDF document text
- http://msslink.ru/userfiles/files/gased.pdfIn PDF document text
- http://www.dogwoodagility.nl/ckfinder/userfiles/files/40310052871.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aaf1301262c---95194032413.pdfIn PDF document text
- https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a0186eea6d354c41635a39ff74307489/37752510134.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=we+use+present+perfectPDF 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_off0000ed31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED31	17740 bytes
SHA-256: `c74237c9bc42484ab8a2bc333400aa52ab15163982a02fc28ca13cbbbf2f29cd`
`font_01_sfnt_off00011bbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BBE	10148 bytes
SHA-256: `3b5376f9a20a71c50c65bf2d2c4c2395ba151cf4d54c444db518146d8dba9967`
`font_02_sfnt_off0001329a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1329A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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