PDF malware analysis — malicious · ae515aba586c22ef

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 23:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 8f0542e7c5df46604fb64284394e535a SHA-1: a59121d0c6edaaeb138c332ba415add1d700f0c8 SHA-256: ae515aba586c22ef5565cb48b3d036bb1a1fa09bc12348ff9ac94a6ae2fc0858

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting the primary function is to host malicious links rather than convey information.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://unite-chem.cn/upload/files/lurevabebu.pdf In PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dde130ba---97605572481.pdfIn PDF document text
- http://blackivy.pl/userfiles/file/gadiduvokanatumuzuduw.pdfIn PDF document text
- http://opersan.com/file/1444261508.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f8ed87f0---fokukubomebudewiga.pdfIn PDF document text
- https://losaltos.com/wysiwygfiles/file/luvoguwibokam.pdfIn PDF document text
- http://minuspk.ru/minuspk.ru/userfiles/file/notoperoravowiz.pdfIn PDF document text
- https://acrgruppe.de/userfiles/file/40411506838.pdfIn PDF document text
- https://rocksoliddesigns.biz/userfiles/file/vapotedibunopixomos.pdfIn PDF document text
- http://sartoriaventurini.com/userfiles/files/tubuxosegurit.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/21ebdddb2e51feb63ff329d0508173da/49928175147.pdfIn PDF document text
- https://pmapmc.com/userfiles/image/files/runujusesipobekelikifi.pdfIn PDF document text
- http://trustycctv.com/ckfinder/userfiles/files/daxoxananelaxibatememopi.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jv3g2pejqvclehno5i7nfmfjsg/91955683162.pdfIn PDF document text
- http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxijejikemorirolifog.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fb0185e7fd143109e5a2f929c3dfdf50/57999401007.pdfIn PDF document text
- http://nguoiquangphianam.com/uploads/files/38292532041.pdfIn PDF document text
- http://kantipursecurity.com/userfiles/file/wonenilalosuxa.pdfIn PDF document text
- http://factorycontrolprojects.com/userfiles/file/dedafelavubafejoxaso.pdfIn PDF document text
- https://philly.drinkpoint.com/uploads/files/rumumelelakuzawulofimezow.pdfIn PDF document text
- http://pillshop.ru/uimg/files/zetiwofizuwexugajuporupav.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383af9d175a---46120423542.pdfIn PDF document text
- http://machulski.com/public/file/dowaserimerer.pdfIn PDF document text
- http://etkenkalip.com/files/82324996989.pdfIn PDF document text
- http://teknis.it/userfiles/files/64105636572.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+a+good+browser+for+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_off0000ee7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE7E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010695.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10695	10804 bytes
SHA-256: `ad5c2257d6cc26c6ffdb778ee10743f6b40f4b5122ad53563b0ce7ed3bea79af`
`font_02_sfnt_off00011f4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F4D	17248 bytes
SHA-256: `e3e0c8f28ef7b880f9cbf94b2ef62e5d024f3066ba9b8dbc95d6762b016bd5d6`

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