PDF malware analysis — malicious · 95ae504fa98b9cd2

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 11:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 816d38462d87da1ae9f04ac59f5bf8c9 SHA-1: fe509f2c7f48267e7eaf5405d57dc20f4d606a68 SHA-256: 95ae504fa98b9cd238754a2f68c3e01cfaff4e9ab99b07a1593dec360a62f31c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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 https://queure.ru/uplcv?utm_term=mixed+operations+maths+worksheets PDF link annotation
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7865d907e918046f27872aaf88cc3277/worizolituvijevivitazat.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fa6297b9078891f1ac61216ed495a569/sililevetuwodafemi.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160996b24d6ed7---3453719256.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612388020cd41---tabawalanonipinebitufux.pdfIn PDF document text
- https://retta-bg.com/userfiles/2190877687.pdfIn PDF document text
- https://perfecthospital.net/ckfinder/userfiles/files/634506647.pdfIn PDF document text
- http://tentimesneedlehill.com/UPFILE/userfiles/files/fogulubirorexik.pdfIn PDF document text
- https://sakkestadbil.no/userfiles/file/konukixumofekepudubesenu.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/60ea0491d23f54d2c4848da24dce2fd8/8762251992.pdfIn PDF document text
- https://socohoteldanang.com/uploads/image/files/7142174182.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098347135123---25463164746.pdfIn PDF document text
- http://sskj.pl/userfiles/file/rugofozufejezedaziw.pdfIn PDF document text
- http://re-view.online/fckFiles/file/jokasowabapawubuvewet.pdfIn PDF document text
- http://zhengfutz.com/v15/Upload/file/20217201224304763.pdfIn PDF document text
- http://photou.cc//ckfinder/userfiles/files/gotoputugodumofu.pdfIn PDF document text
- http://hzjksj.com/images/upload/File/16486746524.pdfIn PDF document text
- http://rcot.by/pics/files/ratawedusawobe.pdfIn PDF document text
- http://shangrilayunnan.com/ckfinder/userfiles/files/30404564183.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc49199ac---sozuvijarubexe.pdfIn PDF document text
- http://menafundinfo.com/userfiles/file/89804095409.pdfIn PDF document text
- http://kstarsmall.net/userfiles/file///79816841626.pdfIn PDF document text
- https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/b17fab9318a5912a3ca4745bfb640e8a/xalikoku.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5b2f60f75---larujolobawijuneza.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/ec6946d7230c5ce35a8d6e38334e218e/metebe.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_off0000d129.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD129	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e93b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE93B	16912 bytes
SHA-256: `a87f675a12159e8284b447eaf73f80b18dfa0839e70d263c5e7d571f6eb7c818`
`font_02_sfnt_off00011529.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11529	10884 bytes
SHA-256: `4dd93f86f48cd148bcf01694f1661219e591c923331c4f82b6dd122903e752f8`

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