PDF malware analysis — malicious · 86feb829a5a276b0

MALICIOUS

PDF

87.8 KB Created: 2021-08-08 16:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 95cf3a39635a8233075069a6d1015287 SHA-1: 7feefd68bebd70631c83eb2060bb58c94c45c272 SHA-256: 86feb829a5a276b00a87b9dad6f16eb6533849e88d7b5946d849bb00a7475b5d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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://quocteanviet.com/img-chamthi/files/sevugibi.pdf In PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda51362713---dekubakinunegidoxula.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0fd12c64---78042780441.pdfIn PDF document text
- http://sammyurias.com/userfiles/files/33989833134.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jbiiel4v94sl88dfme05kh5k3i/45710137412.pdfIn PDF document text
- https://kclandscapes.com/ckfinder/triplebuserfiles/file/12591512475.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d002b61caa---4796074006.pdfIn PDF document text
- http://investin-khj.ir/ckfinder/userfiles/files/xosarebekanoxem.pdfIn PDF document text
- http://studiocinti.eu/userfiles/files/38293239412.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/2fcm1bpotv7n5opvo80kapol2t/xateguvu.pdfIn PDF document text
- http://saothienemb.com/uploads/images/files/migijulipapukaluzexi.pdfIn PDF document text
- http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/zerupebafodajegew.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4dfcc3ccde---26035925933.pdfIn PDF document text
- https://ntwbearing.com/UserFiles/File/888990023.pdfIn PDF document text
- http://greenworx.eu/images/uploads/files/22809788090.pdfIn PDF document text
- https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qvdicedj7k3e461no3en2pge8f/xakalijowanobokenim.pdfIn PDF document text
- https://www.ebenisterie-burette.com/ckfinder/userfiles/files/84313781187.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/ropaxezenutalijoja.pdfIn PDF document text
- http://stin-verdon.fr/assets/Image//files/1232573723.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5ee33ae911610f599d28734e57865b73/xuferija.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be874a37838---paxenagisurapeko.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c253d17f196---23381715532.pdfIn PDF document text
- https://aydin-elektrik.com/resimler/files/torogepomajomixekorijof.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6770bded89---17173897361.pdfIn PDF document text
- http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/077ef4ff172ef4880dc707b9d5535287/fujusi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+super+mugen+jus+2018+downloadPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d897.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD897	18788 bytes
SHA-256: `a1c6dc605077e544eb796d522491b374d3ae3bf276b1e095ec959326fa47849a`
`font_01_sfnt_off00010729.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10729	16204 bytes
SHA-256: `8bcc070ff20c027f7494cea7f783612adf7e1b6d7f8765a9ac06f5986c6e82d0`
`font_02_sfnt_off00011cfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CFC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013513.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13513	11504 bytes
SHA-256: `8bbfde7253acb8de662a3a61ff1cbb46c14c16c52fc1abfc086d9f33e1303a18`

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