PDF malware analysis — malicious · 6219f1103401ece0

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 4545ad2cc662438520e8aada070f6af0 SHA-1: a04d4f77573bf629a083fd26f4ce9fdf57f389b0 SHA-256: 6219f1103401ece0356b7ed32f537d52a620c03a81091ed4bd5aa1b84133228a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to phish or distribute further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://csc0451.com/userfiles/file/20210906083323_6hvyl7.pdf In PDF document text
- http://zartmobilia.com/userfiles/file/20210914042938.pdfIn PDF document text
- https://classoft.ro/userfiles/file/rabukopi.pdfIn PDF document text
- http://nuklearmedizin-amro.de/userfiles/file/tulevusogafovada.pdfIn PDF document text
- https://processwork.archerhuang.com/ConImg/files/47481882775.pdfIn PDF document text
- https://planningpvedh.nl/ckfinder/userfiles/files/77660801437.pdfIn PDF document text
- http://aci-immobilier-douai.fr/userfiles/files/saretimowegilubifexasi.pdfIn PDF document text
- https://smartmedia.ro/app/webroot/files/userfiles/files/24352435352.pdfIn PDF document text
- http://sumisaedu.com/FileData/ckfinder/files/20210902_486A8BDC71E50CDD.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f81f6b4c31---78964199273.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff01e6e9b3---11276467670.pdfIn PDF document text
- http://wellfoto.cz/pictures/files/jupinikepabufewapak.pdfIn PDF document text
- http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/37093736672.pdfIn PDF document text
- https://adikkedua.com/contents/files/41457998664.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc307dc8c---24486630948.pdfIn PDF document text
- https://ladymamashop.com/uploads/files/202109071632139254.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7c2a4c76313a877dced962d8e32625f8/rotolutaluworipuwepakin.pdfIn PDF document text
- https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/28370244239.pdfIn PDF document text
- http://nepodoshlo.kz/ckfinder/userfiles/files/gozog.pdfIn PDF document text
- https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/34206434049.pdfIn PDF document text
- http://galsabino.it/userfiles/files/gowijoxomobalikaxibi.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/epfpjt0qbvu1p9a5331i8ffi36/37213508711.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312fbba16c4---7486158062.pdfIn PDF document text
- http://fuhua.tumujike.com/assets/upload/files/202109032121182403.pdfIn PDF document text
- http://sangjeom.com/userfiles/file///56304971384.pdfIn PDF document text
- http://diplomat2014.ru/ckfinder/userfiles/files/wozapora.pdfIn PDF document text
- http://asia-test.informacittadino.net/media/files/48110515413.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+send+files+via+bluetooth+iphone+to+androidPDF 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_off0000e222.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE222	10980 bytes
SHA-256: `1c20559d36da87d15dd34834d104d18efc0a84fb57d651a0befd51a26c249092`
`font_01_sfnt_off0000fb55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB55	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011367.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11367	17132 bytes
SHA-256: `de580a2bdd9812180eb2ab0438b5fd9098a39308496102fba824987ce41412c4`

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