PDF malware analysis — malicious · 1cae91ed7d5d9c08

MALICIOUS

PDF

76.6 KB Created: 2021-08-28 00:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a68a962e0d1958ab4908adfcff157fcf SHA-1: 0a9c676fb0c9501efcbc691562beb03c12549613 SHA-256: 1cae91ed7d5d9c08631dbb95cf8d4709592f735172f4cc1ccfe368893a0d2bb9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6ec35c3ec7c2dd703f87d64fce84a239/naduke.pdf In PDF document text
- http://eibich.de/layout/bilder/file/28627917321.pdfIn PDF document text
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e28b4be055c70829a86a9e3989f05346/jetilozarisojaxebaj.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075623567a03---77645884461.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161012d5d22bfe---lebafi.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dc0d077cb---vikusetorutomuxekole.pdfIn PDF document text
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/90bb1940876e24f5803f44928eb7889b/71941126471.pdfIn PDF document text
- http://www.anieliasfx.com/uploads/textareas/file/xofineji.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/37530352835.pdfIn PDF document text
- https://infiniteprospects.com/FCKeditor/file/63449042739.pdfIn PDF document text
- https://koreayokogawa.com/ckfinder/userfiles/files/26600886432.pdfIn PDF document text
- https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/m6uanp7vfrvntlfv95v37umbva/8553928084.pdfIn PDF document text
- http://konyaozgunmobilya.com/userfiles/file/66574582084.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7830d3d88---60948224993.pdfIn PDF document text
- http://toptoptraining.ru/img/upload/file/3656916922.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/1ilqf8e8fg43us8ko6c92oj6no/gekisuz.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc972d53b8---gobiwafala.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/p27m64kscujfrqs9g4foj38lb2/7234314443.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/86unpdrgup25ojbnh7qk9bno95/nutinapen.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1c3df337bb1c43f5138fca00ccad6dab/74312399807.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4658948e81---rujuw.pdfIn PDF document text
- http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/wejuparer.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3607ca51d0---65319782721.pdfIn PDF document text
- https://goodline.by/userfiles/file/walenikoduxawobirixakig.pdfIn PDF document text
- http://heatherjansch.com/ckfinder/userfiles/files/24769921961.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=michelle+williams+with+long+hairPDF 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_off0000c71d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC71D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000df2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF2F	16500 bytes
SHA-256: `18ea5325694984c594dd05a32982d05c534989c2ab9c942726dd4a4966be46d8`
`font_02_sfnt_off000109b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109B2	10756 bytes
SHA-256: `1d2024abe7e1873b9e1d22bd3e0a27fcf1fdf9b0e8eb9f067d4ebb2841542e16`

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