PDF malware analysis — malicious · 660d15d33c76d1e3

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 04:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: b96dda9aa8f78ca31cab795c530a3bf2 SHA-1: dae70b3fd83bedd7d386dda7cf2f38164c827d60 SHA-256: 660d15d33c76d1e3817b103dcf8b3c75d0f52446e4a67b07979ba175eb64b140

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farms strongly supports a phishing or malicious redirection attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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 https://oniceh.ru/uplcv?utm_term=sync+my+phone PDF link annotation
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/64o8oene6jhp2sfos2ac24ed20/82179646912.pdfIn PDF document text
- https://nikolsbeauty.com/webroot/f/uploads/file/95450934016.pdfIn PDF document text
- https://dnsbp.com/all4help/fckuserfiles/file/jawadi.pdfIn PDF document text
- https://abcoegypt.com/userfiles/files/23030339351.pdfIn PDF document text
- https://101doctor.com/uploads/ckfiles/files/613eafbdd89cd.pdfIn PDF document text
- https://sbsoftware.ro/admin/userfiles/file/radaxawow.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/voxival.pdfIn PDF document text
- http://rsentco.com/upload/file/jawatodawiwa.pdfIn PDF document text
- http://laser-piskovani.cz/democms/userfiles/file/demabixadimitefivuwo.pdfIn PDF document text
- http://hopkim.vn/upload/files/sawivimajuboturizedoxofip.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/29cfae36b2ca8455ded56e60fe810673/zizesujevedutoputiworero.pdfIn PDF document text
- https://suprizpin.com/calisma2/files/uploads/xajatazatejarud.pdfIn PDF document text
- http://a9188.com/upload_files/art_files/files/20210908_070010.pdfIn PDF document text
- https://optimuselearningschool.com/learning/site/images/uploadfiles/49414333197.pdfIn PDF document text
- http://www.alcera.ca/userfiles/file/tomibuj.pdfIn PDF document text
- https://didacostruzioni.it/userfiles/file/76964442082.pdfIn PDF document text
- http://lexprikson.com/admin/style/images/userfiles/file/xabusawakulebube.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0h0ofmjr1hnj7bfaah2nsktq5s/fuzesipodafodezososorelof.pdfIn PDF document text
- https://millvalley.com/wysiwygfiles/file/duzipifopuwetober.pdfIn PDF document text
- http://kripasec.com/userfiles/file/vobulazonesasu.pdfIn PDF document text
- http://chiron-ventures.com/chiron/home/img/upload/files/210906023147578839o6a75.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84ba69bcf---83827327822.pdfIn PDF document text
- https://floridainvestment.cz/files/file/lejosivuxidubo.pdfIn PDF document text
- http://sten.kr/club/data/userfiles/file/20210916115706.pdfIn PDF document text
- https://wcfkenzi.com/ckfinder/userfiles/files/mizijozirivajexelite.pdfIn PDF document text
- https://flour.co.uk/ckfinder/userfiles/files/tumawuvisirasizexoti.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b137316be---85563960241.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_off0000d4e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4E7	10160 bytes
SHA-256: `e179f39ac551c04df4c2296b085ba8e82c44760106d868075ec82b054950e787`
`font_01_sfnt_off0000eb6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB6F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010381.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10381	17640 bytes
SHA-256: `943033fd58b228cd568124dc570002a6fdb45bb8d33739756d8a7432084451a2`

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