PDF malware analysis — malicious · 88b2d9cca6eb1c23

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 02:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 826233278cb4fb2a24a5d39310661205 SHA-1: bcdcb4e14c2fa823436f2306857e8d7fe053d327 SHA-256: 88b2d9cca6eb1c23e4ad8370f2332894377a19212d50af04954df4b8ebeb36c3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories and other potentially disposable hosting. These links are likely intended to redirect users to phishing or malware distribution sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://avs-market.ru/admin/ckfinder/userfiles/files/badaluzad.pdf In PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b970e624ac---46574114233.pdfIn PDF document text
- http://nationshield.ae/userfiles/files/fozinilexajavofibeki.pdfIn PDF document text
- http://britishcytology.org.uk/ckfinder/userfiles/files/nejironofukudova.pdfIn PDF document text
- http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/73666755803.pdfIn PDF document text
- http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/xogivite.pdfIn PDF document text
- http://iweldbot.com/ckfinder/pho/files/1727692435.pdfIn PDF document text
- https://thehideawayresortpattaya.com/userfiles/files/liloluzarufovup.pdfIn PDF document text
- https://rajaketiga.com/contents/files/nuroguzukemak.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0f6bd76db---jovezafegofi.pdfIn PDF document text
- https://bawwabatrizq.com/userfiles/file/gilitibonazez.pdfIn PDF document text
- http://designerhouse.ru/upload/files/dusunevetelux.pdfIn PDF document text
- http://taikenplan.jp/ckfinder/userfiles/files/dudugidovi.pdfIn PDF document text
- http://creativeindustries.ru/uploads/userfiles/file/12256216607.pdfIn PDF document text
- https://aimhc.com/userfiles/file/25275210468.pdfIn PDF document text
- https://nikoljski.com/ckfinder/userfiles/files/mefetu.pdfIn PDF document text
- https://bold-iot.com/uploads/files/202109121127133956.pdfIn PDF document text
- http://pro-roubenky.cz/UserFiles/File/70712145774.pdfIn PDF document text
- http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/dinukolefudi.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161509c521c7b9---worizijurufosutefuri.pdfIn PDF document text
- http://opusincertum.it/userfiles/files/xixes.pdfIn PDF document text
- http://fatfailogistics.com/fckeditor/files/file/64366837118.pdfIn PDF document text
- https://rowanmkt.com/Uploads/ckfinder/userfiles/files/90677010832.pdfIn PDF document text
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf70d8bcf---devefusiloxurusimovani.pdfIn PDF document text
- https://niceppl.com/images/file/36326490323.pdfIn PDF document text
- http://l-max.ru/userfiles/file/91351746225.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sync+is+unable+to+initialize+android+autoPDF 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_off0000b4c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4C9	10852 bytes
SHA-256: `ec6f64bff70a5af852bdcc58a0005b94dd58d11b3aa1e8777edeb3e355166547`
`font_01_sfnt_off0000ce05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE05	17480 bytes
SHA-256: `4e9919a577b8835fb39e7d194ed67f665b3f88cae041a5426364b056ec6dfe34`
`font_02_sfnt_off0000fae8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAE8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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