PDF malware analysis — malicious · 18b08008691f7778

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 16:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 53d8429745d1fc9854c6b350180b4d5b SHA-1: 99206521de816c680031f83dce75a2e1d899cb59 SHA-256: 18b08008691f7778245d261b7d832e1f591cd1883a8bc3c0d2f50ef6712d3e06

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document contains multiple links to compromised websites, likely intended to trick the user into downloading a remote-support tool. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the document's structure and embedded URLs suggest it is designed to facilitate the download of a second-stage payload, potentially a RAT or other remote access trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Remote-support tool lure high SE_REMOTE_SUPPORT_LURE

Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
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://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160780284670fa---86876814137.pdf In PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f87439a8f12---momikolerivogosiwuge.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123abd78d08e---wejok.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/baleluj.pdfIn PDF document text
- http://immodraft.nrw/images/architekten_agentur_images_/file/mavebebaporut.pdfIn PDF document text
- http://belean.pl/userfiles/file/xejokerugimewe.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d669be6136---73680865603.pdfIn PDF document text
- http://scriptonica.ru/files/files/28790888730.pdfIn PDF document text
- http://vonschickenfremont.com/uploads/files/16826200348.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/658648cb5a0c27b1a76feadf2c476599/45400680585.pdfIn PDF document text
- https://ppuhperspektywa.pl/files/edytor/file/38944963101.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce23c8711a---54801344306.pdfIn PDF document text
- http://geredekombiservisi.com/userfiles/file/34116070764.pdfIn PDF document text
- https://basalyemek.com/ckfinder/userfiles/files/82048500352.pdfIn PDF document text
- https://planet-for-events.de/userfiles/file/zivedi.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160983bcf21d58---17186899639.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5847c17e4---dapaze.pdfIn PDF document text
- http://www.masozilina.sk/ckfinder/userfiles/files/45914208164.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/baef185d6fbeb7eebb34a005bd46acc4/39201671970.pdfIn PDF document text
- https://bcbc3399.com/upload/files/vamisekonoxizusofa.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f081a1ed0---nilapafusadosemafedow.pdfIn PDF document text
- http://shuswapladystriders.ca/userfiles/file/memagikiratokavazolosom.pdfIn PDF document text
- https://vinaconexmec.vn/uploads/news_file/58610776583.pdfIn PDF document text
- http://mygiftltd.com/userfiles/file/91890828981.pdfIn PDF document text
- https://northcoteplaza.com/userfiles/file/55388872797.pdfIn PDF document text
- http://autoset66.ru/admin/ckfinder/userfiles/files/39393385261.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nom+035+stps+ergonomia+pdfPDF 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_off0000d7d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7D3	18180 bytes
SHA-256: `f8a15aca3a6eae961d8bc24314efb2d3ca574810aaaa2e99cbc132ed75387e65`
`font_01_sfnt_off00010724.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10724	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011f3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F3B	11200 bytes
SHA-256: `1f7b20196413309b7199b97fbdcf5b0ddb37ba185cb71f48c1fbf133f9d36fa6`

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