Malicious PDF — malware analysis report

Static analysis result for SHA-256 99053e6814b4baf8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 05:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3f1a0af1592d3ae11788031c029075f SHA-1: 89f8c27d95b790867bdc3e78b09ca398cbe71c3d SHA-256: 99053e6814b4baf8929700776e5e9baf6126940d41823e0203b6527434f10f27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://miyagi.chi-kara.net/Upload/files/14551114825.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/zufoxifa.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61797925959.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136502c24ca6---45826702006.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/nemifaxozogubepobaduzi.pdf
    • http://maremania.net/img_pagine/file/doligazuduwetub.pdf
    • http://innersolutions-uk.com/file/nerelumiza.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d47dea8a7---kimitor.pdf
    • http://officegate.biz/admin/fck_upload/file/benefonavejo.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/12835300663.pdf
    • http://zbirozskepodzamci.cz/userfiles/1281000911.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2515828eb4d3022c2ef2af871ebd5f59/fedibogapixusogejofu.pdf
    • http://wirheiraten.de/images/file/zebiwunusabu.pdf
    • http://surtek.biz/image/files/20150319_095639.pdf
    • http://acpiindia.com/userfiles/file/jowifuwovadeveviwaxa.pdf
    • http://shqinze.net/admin/upimg/file///46537689557.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/38570466121.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/xeven.pdf
    • http://caopump.com/admin/userfiles/file/wuvowe.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed83b0bafd---51180638887.pdf
    • https://arabadvertise.com/userfiles/files/4257983437.pdf
    • https://paymentor.nl/uploads/file/zozifawewuxipe.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1716f822b5b8e5c8554a2ccdfbf6aacd/58820563524.pdf
    • http://evo-models.com/uploads/userfiles/files/15711420448.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bfg+full+movie+in+telugu+watch+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bccc.bin
811d08b460a32c9ac66aa16d3979287ac15379c1ee7891397b4d1897aa429042
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 17772 bytes
font_01_sfnt_off0000e9a5.bin
c363716d000d95b5f688f4ce1eae120d6a23257b9471c5e0252a3f51e2d526f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 10820 bytes
font_02_sfnt_off0001028b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 16792 bytes