Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9cd9df743bb7f4…

MALICIOUS

PDF

121.3 KB Created: 2021-08-17 06:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a6bb31eea022773b1f53f38412cd0cc SHA-1: fc7350bb25d4212534b48ad0b22a9dd48be6b9e7 SHA-256: ba9cd9df743bb7f40f98bc385317522cefd0da9919c0951c6f207414fecbbaff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs, many pointing to PDF files on various domains, supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://longvu.vn/Images_upload/files/3308020963.pdf In PDF document text
    • http://asokmontridental.com/userfiles/file/wiledasodajipizazuguge.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/43482770998.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6868aae2527ef200608007f279f12929/fipadagikepufot.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/73520251438.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kevomubuni.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/71112897375.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/23988525393.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/24535e69441961a60cff1a806c1ff321/93228630196.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3ea784fe5c458840d6e8eff187a87b61/88159903546.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ae103b55aa1---vejixutivuva.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/lekuguwijuzidaboji.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/bodimobitivaki.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/21f7720f16bfcf4a29141394c1540e6a/46274183141.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1d8c343b---31571634834.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/8302131901.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3765e47e---nijuzufuwanokonuvopotu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kilofuwitazerunibuzarog.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vp60kqsao0v6oo16l8ielsvg30/5296598711.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88694a364a---45949175397.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078197c073ca---94413661735.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c865f52257---zanevuzigawawulev.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/71811558182.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd4a9ace1---61727506554.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/velebukix.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d41f1c7e5---80881398963.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/63824086229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=motu+patlu+cartoon+2020+ka+new+episodePDF 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.

FilenameKindSourceSize
font_00_sfnt_off0001772b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1772B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F42 11020 bytes
SHA-256: 6ad920aa05e9146a26af897b62e7f52bf6fdab89f5182d7dcd7f6541a5e1e0a4
font_02_sfnt_off0001a922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A922 17356 bytes
SHA-256: 5f7bebe099b9f1c8e59e2da63fe3d3e963fb4b282d5c49fdee8394847a458b36