PDF malware analysis — malicious · 84240b749938a270

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 11:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 96c9d157009e13968eeefcbc509f0d32 SHA-1: 2a6218d8bc8d4ca44ddff2cb494896d565417081 SHA-256: 84240b749938a2701822da9c8a76e08b9ee40414e63fbdcdc76ca3e23e74201a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous external URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised sites suggests an attempt to obscure the true malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://karlsbach.de/userfiles/files/16038290538.pdf In PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140376fca431---48433315743.pdfIn PDF document text
- http://lamardaegu.com/upfile/user/file/25700137833.pdfIn PDF document text
- https://biomisszio.hu/tmp/wovapavuzegi.pdfIn PDF document text
- https://360clothing.in/home/www360cl/public_html/uploads/images/files/46529858372.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3d0d7b6c555c173fde170bae9a2ae720/diwezikafosujovuvito.pdfIn PDF document text
- http://sola-brothers.com/userfiles/file/48067995713.pdfIn PDF document text
- https://mvmdigital.gr/files/files/9563381034.pdfIn PDF document text
- http://gaia-onlus.org/userfiles/file/35609345585.pdfIn PDF document text
- https://vcubusinesssolutions.com/userfiles/file/33051579395.pdfIn PDF document text
- https://moyaexpresss.com/ckfinder/userfiles/files/xoxujumirix.pdfIn PDF document text
- http://jujucuisine.com/userfiles/file/gomolofiwutugawaworagej.pdfIn PDF document text
- http://raffaelecavazzoni.com/userfiles/files/xavotokorubabudakad.pdfIn PDF document text
- http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/61389767244.pdfIn PDF document text
- http://mecateengenharia.com.br/ckfinder/userfiles/files/gujunadowozu.pdfIn PDF document text
- http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/81192421660.pdfIn PDF document text
- http://gps-tw.com/CKEdit/upload/files/90266248427.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d4f2a0b86c6acb9867c60d393edb043/tumasiwimadobuxawasetige.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b552c0b7---8446269964.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bec997e3b47c397f81474dd82b77c268/97139832635.pdfIn PDF document text
- http://paradisetourkorea.com/FileData/ckfinder/files/20210901_01DDDD5626771309.pdfIn PDF document text
- https://pinpointfeedtech.com/ckfinder/userfiles/files/lunokilinopevokepurewufed.pdfIn PDF document text
- http://swaminarayangm.org/userfiles/file/jilagomanasebidowuvow.pdfIn PDF document text
- http://mywayrtk.org/userfiles/file/dodikino.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135cd609df57---vemuporenovakexuxusukigif.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+android+file+manager+2017PDF 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_off0000ec75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC75	17344 bytes
SHA-256: `4467bc6f05f5ffe0ec7ab1c72fd1e0cac12d309d149a31e330144cec8dcc5585`
`font_01_sfnt_off000119a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119A2	11096 bytes
SHA-256: `011842d752d0cde3767b576d1b943de8677e407e813d73e687af939952e4de28`
`font_02_sfnt_off00013371.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13371	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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